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Thread: Little Help, Price Reset is not working

  1. #1
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    Default Little Help, Price Reset is not working

    Hi,

    I have wrote my Java code but I notice when I click on ClearAll button, it clears all fields apart from the price, I think there is code missing in my script someone fix it for me please.




    CarSale.Java
    import java.applet.Applet; 
    import java.awt.Button; 
    import java.awt.Color; 
    import java.awt.Label; 
    import java.awt.TextArea; 
    import java.awt.TextField; 
    import java.awt.event.ActionEvent; 
    import java.awt.event.ActionListener; 
     
    public class CarSale extends Applet implements ActionListener { 
     
       private TextArea txaCars, txaSelected; 
       private TextField txfSelItem; 
       private Label lblCarNo; 
       private Label lblTitle; 
       private TextField txffirstname; 
       private Label lblfirstname; 
       private TextField txflastname; 
       private Label lbllastname; 
       private TextField txfaddress; 
       private Label lbladdress; 
       private TextField txfpostcode; 
       private Label lblpostcode; 
       private Label lblemail; 
       private TextField txfemail; 
       private Label lblphone; 
       private TextField txfphone; 
       private Label lblTotal; 
       private Color colTotal = Color.LIGHT_GRAY;
       private float total;
     
       private Button btnGetItem, btnClearItems, btnClearInfo, btnClearAll, btnSubmit; 
     
       private final int MAXCARS = 100;   // maximum size of arrays 
     
       private Car[] cars;         // cars on offer 
       private Car[] pickedCars;      // cars selected 
     
       private int nbrOfCars = 0;      // number of cars on offer 
       private int nbrCarsPicked = 0;   // number of cars picked so far 
       private int nbrToPick = 0;         // number of cars chosen 
     
       public void init(){ 
          setSize(600,510); 
          setLayout(null); 
          setBackground(Color.GREEN); 
     
          createGUI(); 
     
          cars = new Car[MAXCARS]; 
          pickedCars = new Car[MAXCARS]; 
          makeCar();       
          displayCars(); 
       } 
     
       private void displayCars() { 
          txaCars.setText(""); 
          for(int i = 0; i < nbrOfCars; i++){ 
             txaCars.append("" + i+ ": "); 
             txaCars.append(cars[i].toString() + "\n"); 
     
          } 
       } 
     
       private void displaySelectedCars() { 
          txaSelected.setText(""); 
          for(int i = 0; i < nbrCarsPicked; i++){ 
             txaSelected.append(pickedCars[i] + "\n"); 
          } 
       } 
     
       private void createGUI() { 
     
           lblTitle=new Label("Auto Trader Car Sales"); 
           lblTitle.setBounds(10,10,585,20); 
           lblTitle.setBackground(Color.yellow); 
           add(lblTitle); 
     
     
          lblfirstname = new Label("First Name"); 
          lblfirstname.setBounds(10,40,90,20);; 
          add(lblfirstname); 
     
          txffirstname= new TextField(""); 
          txffirstname.setBounds(110,80,150,20); 
          add(txffirstname); 
     
          lbllastname = new Label("Last Name"); 
          lbllastname.setBounds(10,60,100,20); 
          add(lbllastname); 
     
          txflastname= new TextField (""); 
          txflastname.setBounds(110,100,150,20); 
          add(txflastname); 
     
     
          lbladdress = new Label ("Address"); 
          lbladdress.setBounds(10,80,100,20); 
          add (lbladdress); 
     
          txfaddress=new TextField(""); 
          txfaddress.setBounds(110,120,150,20); 
          add(txfaddress); 
     
     
          lblpostcode =new Label("Post Code"); 
          lblpostcode.setBounds(10,100,100,20); 
          add(lblpostcode); 
     
          txfpostcode=new TextField(""); 
          txfpostcode.setBounds(110,60,150,20); 
          add(txfpostcode); 
     
          lblemail=new Label("Email"); 
          lblemail.setBounds(10,120,100,20); 
          add(lblemail); 
     
          txfemail=new TextField(""); 
          txfemail.setBounds(110,40,150,20); 
          add(txfemail); 
     
          lblphone=new Label("Phone"); 
          lblphone.setBounds(10,140,100,20); 
          add(lblphone); 
     
          txfphone=new TextField(""); 
          txfphone.setBounds(110,140,150,20); 
          add(txfphone); 
     
          btnClearInfo = new Button("Clear Information"); 
          btnClearInfo.setBounds(130,165,110,24); 
          btnClearInfo.addActionListener(this); 
          add(btnClearInfo); 
     
           lblTitle=new Label("Cars For Sale"); 
           lblTitle.setBounds(10,200,585,20); 
           lblTitle.setBackground(Color.yellow); 
           add(lblTitle); 
     
           lblTitle=new Label("Shopping Basket"); 
           lblTitle.setBounds(10,345,585,20); 
           lblTitle.setBackground(Color.yellow); 
           add(lblTitle); 
     
          txaCars = new TextArea("", 10,10,TextArea.SCROLLBARS_BOTH); 
          txaCars.setBounds(10,225,585,85); 
          add(txaCars); 
     
          txaSelected = new TextArea("", 10,10,TextArea.SCROLLBARS_BOTH); 
          txaSelected.setBounds(10,370,585,85); 
          add(txaSelected); 
     
          lblCarNo = new Label("Car Number ?"); 
          lblCarNo.setBounds(56,315,80,30); 
          add(lblCarNo); 
     
          txfSelItem = new TextField(""); 
          txfSelItem.setBounds(140,320,40,20); 
          txfSelItem.addActionListener(this); 
          add(txfSelItem); 
     
          btnGetItem = new Button("Get Car"); 
          btnGetItem.setBounds(200,317,110,24); 
          btnGetItem.addActionListener(this); 
          add(btnGetItem); 
     
          btnClearItems = new Button("Clear Basket"); 
          btnClearItems.setBounds(10,460,110,24); 
          btnClearItems.addActionListener(this); 
          add(btnClearItems); 
     
          btnClearAll = new Button("Clear All"); 
          btnClearAll.setBounds(140,460,110,24); 
          btnClearAll.addActionListener(this); 
          add(btnClearAll); 
     
          btnSubmit = new Button("Submit Order"); 
          btnSubmit.setBounds(480,480,110,24); 
          btnSubmit.addActionListener(this); 
          add(btnSubmit); 
     
          lblTotal = new Label("0.00");
          lblTotal.setBounds(460,457,130,20);
          lblTotal.setBackground(colTotal);
          add(this.lblTotal);
     
     
     
       } 
     
       public void actionPerformed(ActionEvent e) { 
     
          // Get item 
          if(e.getSource() == btnGetItem || e.getSource() == txfSelItem){ 
             try { 
                nbrToPick = Integer.parseInt(txfSelItem.getText()); 
             } 
             catch(Exception ex){ 
                txfSelItem.setText(""); 
                return; 
             } 
             // See if item exists foe item no entered and there is 
             // room in picked array 
             if(nbrToPick >= 0 && nbrToPick < nbrOfCars 
                   && nbrCarsPicked < MAXCARS){ 
                pickedCars[nbrCarsPicked] = cars[nbrToPick]; 
                nbrCarsPicked++; 
                displaySelectedCars(); 
                total = total + cars [nbrToPick].getValue();
                displayTotal();
             } 
             txfSelItem.setText("");             
          }    
          if(e.getSource() == btnClearItems){ 
             txfSelItem.setText("");             
             txaSelected.setText(""); 
             for(int i = 0; i < nbrCarsPicked ; i++) 
                pickedCars[i] = null; 
             nbrCarsPicked = 0;          
             System.out.println("EMPTY SHOPPING BASKET");
          }   
          if(e.getSource() == btnClearInfo){ 
             txffirstname.setText("");             
             txflastname.setText(""); 
             txfaddress.setText(""); 
             txfpostcode.setText(""); 
             txfemail.setText(""); 
             txfphone.setText("");      
             System.out.println("CLEAR CUSTOMER INFORMATION");
          } 
     
       if(e.getSource() == btnClearAll){ 
          txfSelItem.setText("");             
          txaSelected.setText(""); 
          txffirstname.setText("");             
          txflastname.setText(""); 
          txfaddress.setText(""); 
          txfpostcode.setText(""); 
          txfemail.setText(""); 
          txfphone.setText("");      
          System.out.println("RESET ALL");
       } 
       if(e.getSource() == btnSubmit){    
    	      txfSelItem.setText("");             
    	      txaSelected.setText(""); 
    	      txffirstname.setText("");             
    	      txflastname.setText(""); 
    	      txfaddress.setText(""); 
    	      txfpostcode.setText(""); 
    	      txfemail.setText(""); 
    	      txfphone.setText("");
           System.out.println("ORDER HAS BEEN SUBMITTED + RESET");
        } 
       }
       private void displayTotal() { 
    	   this.lblTotal.setText("" + this.total);
       } 
       private void makeCar() { 
          cars[nbrOfCars] = new Car("Ferrari F430", 120000.00f); 
          nbrOfCars++; 
          cars[nbrOfCars] = new Car("BMW M3", 15000.00f); 
          nbrOfCars++; 
          cars[nbrOfCars] = new Car("Benz Classic", 250000.00f); 
          nbrOfCars++; 
          cars[nbrOfCars] = new Car("Skyline GT", 30000.00f); 
          nbrOfCars++; 
       } 
    }

    Car.java
    public class Car {
     
    	String name;
    	float value;
     
    	/**
    	 * @param name the name of the Car
    	 * @param value	the value of the Car
    	 */
    	public Car(String name, float value) {
    		super();
    		// TODO Auto-generated constructor stub
    		this.name = name;
    		this.value = value;
    	}
     
    	/**
    	 * @return Returns the name.
    	 */
    	public String getName() {
    		return name;
    	}
     
    	/**
    	 * @param name The name to set.
    	 */
    	public void setName(String name) {
    		this.name = name;
    	}
     
    	/**
    	 * @return Returns the value.
    	 */
    	public float getValue() {
    		return value;
    	}
     
    	/**
    	 * @param value The value to set.
    	 */
    	public void setValue(float value) {
    		this.value = value;
    	}
     
    	/**
    	 * Car display string
    	 */
    	public String toString() {
    		return name + "  (" + value + ")";
    	}
    }

    regards


  2. #2
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    Default Re: Little Help, Price Reset is not working

    Hello drkossa.

    The problem is that you are missing lblTotal.setText(""); from your clear methods. Try:

    import java.applet.Applet; 
    import java.awt.Button; 
    import java.awt.Color; 
    import java.awt.Label; 
    import java.awt.TextArea; 
    import java.awt.TextField; 
    import java.awt.event.ActionEvent; 
    import java.awt.event.ActionListener; 
     
    public class CarSale extends Applet implements ActionListener { 
     
       private TextArea txaCars, txaSelected; 
       private TextField txfSelItem; 
       private Label lblCarNo; 
       private Label lblTitle; 
       private TextField txffirstname; 
       private Label lblfirstname; 
       private TextField txflastname; 
       private Label lbllastname; 
       private TextField txfaddress; 
       private Label lbladdress; 
       private TextField txfpostcode; 
       private Label lblpostcode; 
       private Label lblemail; 
       private TextField txfemail; 
       private Label lblphone; 
       private TextField txfphone; 
       private Label lblTotal; 
       private Color colTotal = Color.LIGHT_GRAY;
       private float total;
     
       private Button btnGetItem, btnClearItems, btnClearInfo, btnClearAll, btnSubmit; 
     
       private final int MAXCARS = 100;   // maximum size of arrays 
     
       private Car[] cars;         // cars on offer 
       private Car[] pickedCars;      // cars selected 
     
       private int nbrOfCars = 0;      // number of cars on offer 
       private int nbrCarsPicked = 0;   // number of cars picked so far 
       private int nbrToPick = 0;         // number of cars chosen 
     
       public void init(){ 
          setSize(600,510); 
          setLayout(null); 
          setBackground(Color.GREEN); 
     
          createGUI(); 
     
          cars = new Car[MAXCARS]; 
          pickedCars = new Car[MAXCARS]; 
          makeCar();       
          displayCars(); 
       } 
     
       private void displayCars() { 
          txaCars.setText(""); 
          for(int i = 0; i < nbrOfCars; i++){ 
             txaCars.append("" + i+ ": "); 
             txaCars.append(cars[i].toString() + "\n"); 
     
          } 
       } 
     
       private void displaySelectedCars() { 
          txaSelected.setText(""); 
          for(int i = 0; i < nbrCarsPicked; i++){ 
             txaSelected.append(pickedCars[i] + "\n"); 
          } 
       } 
     
       private void createGUI() { 
     
           lblTitle=new Label("Auto Trader Car Sales"); 
           lblTitle.setBounds(10,10,585,20); 
           lblTitle.setBackground(Color.yellow); 
           add(lblTitle); 
     
     
          lblfirstname = new Label("First Name"); 
          lblfirstname.setBounds(10,40,90,20);; 
          add(lblfirstname); 
     
          txffirstname= new TextField(""); 
          txffirstname.setBounds(110,80,150,20); 
          add(txffirstname); 
     
          lbllastname = new Label("Last Name"); 
          lbllastname.setBounds(10,60,100,20); 
          add(lbllastname); 
     
          txflastname= new TextField (""); 
          txflastname.setBounds(110,100,150,20); 
          add(txflastname); 
     
     
          lbladdress = new Label ("Address"); 
          lbladdress.setBounds(10,80,100,20); 
          add (lbladdress); 
     
          txfaddress=new TextField(""); 
          txfaddress.setBounds(110,120,150,20); 
          add(txfaddress); 
     
     
          lblpostcode =new Label("Post Code"); 
          lblpostcode.setBounds(10,100,100,20); 
          add(lblpostcode); 
     
          txfpostcode=new TextField(""); 
          txfpostcode.setBounds(110,60,150,20); 
          add(txfpostcode); 
     
          lblemail=new Label("Email"); 
          lblemail.setBounds(10,120,100,20); 
          add(lblemail); 
     
          txfemail=new TextField(""); 
          txfemail.setBounds(110,40,150,20); 
          add(txfemail); 
     
          lblphone=new Label("Phone"); 
          lblphone.setBounds(10,140,100,20); 
          add(lblphone); 
     
          txfphone=new TextField(""); 
          txfphone.setBounds(110,140,150,20); 
          add(txfphone); 
     
          btnClearInfo = new Button("Clear Information"); 
          btnClearInfo.setBounds(130,165,110,24); 
          btnClearInfo.addActionListener(this); 
          add(btnClearInfo); 
     
           lblTitle=new Label("Cars For Sale"); 
           lblTitle.setBounds(10,200,585,20); 
           lblTitle.setBackground(Color.yellow); 
           add(lblTitle); 
     
           lblTitle=new Label("Shopping Basket"); 
           lblTitle.setBounds(10,345,585,20); 
           lblTitle.setBackground(Color.yellow); 
           add(lblTitle); 
     
          txaCars = new TextArea("", 10,10,TextArea.SCROLLBARS_BOTH); 
          txaCars.setBounds(10,225,585,85); 
          add(txaCars); 
     
          txaSelected = new TextArea("", 10,10,TextArea.SCROLLBARS_BOTH); 
          txaSelected.setBounds(10,370,585,85); 
          add(txaSelected); 
     
          lblCarNo = new Label("Car Number ?"); 
          lblCarNo.setBounds(56,315,80,30); 
          add(lblCarNo); 
     
          txfSelItem = new TextField(""); 
          txfSelItem.setBounds(140,320,40,20); 
          txfSelItem.addActionListener(this); 
          add(txfSelItem); 
     
          btnGetItem = new Button("Get Car"); 
          btnGetItem.setBounds(200,317,110,24); 
          btnGetItem.addActionListener(this); 
          add(btnGetItem); 
     
          btnClearItems = new Button("Clear Basket"); 
          btnClearItems.setBounds(10,460,110,24); 
          btnClearItems.addActionListener(this); 
          add(btnClearItems); 
     
          btnClearAll = new Button("Clear All"); 
          btnClearAll.setBounds(140,460,110,24); 
          btnClearAll.addActionListener(this); 
          add(btnClearAll); 
     
          btnSubmit = new Button("Submit Order"); 
          btnSubmit.setBounds(480,480,110,24); 
          btnSubmit.addActionListener(this); 
          add(btnSubmit); 
     
          lblTotal = new Label("0.00");
          lblTotal.setBounds(460,457,130,20);
          lblTotal.setBackground(colTotal);
          add(this.lblTotal);
     
     
     
       } 
     
       public void actionPerformed(ActionEvent e) { 
     
          // Get item 
          if(e.getSource() == btnGetItem || e.getSource() == txfSelItem){ 
             try { 
                nbrToPick = Integer.parseInt(txfSelItem.getText()); 
             } 
             catch(Exception ex){ 
                txfSelItem.setText(""); 
                return; 
             } 
             // See if item exists foe item no entered and there is 
             // room in picked array 
             if(nbrToPick >= 0 && nbrToPick < nbrOfCars 
                   && nbrCarsPicked < MAXCARS){ 
                pickedCars[nbrCarsPicked] = cars[nbrToPick]; 
                nbrCarsPicked++; 
                displaySelectedCars(); 
                total = total + cars [nbrToPick].getValue();
                displayTotal();
             } 
             txfSelItem.setText("");             
          }    
          if(e.getSource() == btnClearItems){ 
             txfSelItem.setText("");             
             txaSelected.setText(""); 
             for(int i = 0; i < nbrCarsPicked ; i++) 
                pickedCars[i] = null; 
             nbrCarsPicked = 0;          
             System.out.println("EMPTY SHOPPING BASKET");
            [B] lblTotal.setText("");[/B]
          }   
          if(e.getSource() == btnClearInfo){ 
             txffirstname.setText("");             
             txflastname.setText(""); 
             txfaddress.setText(""); 
             txfpostcode.setText(""); 
             txfemail.setText(""); 
             txfphone.setText("");      
             System.out.println("CLEAR CUSTOMER INFORMATION");
          } 
     
       if(e.getSource() == btnClearAll){ 
          txfSelItem.setText("");             
          txaSelected.setText(""); 
          txffirstname.setText("");             
          txflastname.setText(""); 
          txfaddress.setText(""); 
          txfpostcode.setText(""); 
          txfemail.setText(""); 
          txfphone.setText("");
         [B] lblTotal.setText("");[/B]
          System.out.println("RESET ALL");
       } 
       if(e.getSource() == btnSubmit){    
              txfSelItem.setText("");             
              txaSelected.setText(""); 
              txffirstname.setText("");             
              txflastname.setText(""); 
              txfaddress.setText(""); 
              txfpostcode.setText(""); 
              txfemail.setText(""); 
              txfphone.setText("");
           System.out.println("ORDER HAS BEEN SUBMITTED + RESET");
        } 
       }
       private void displayTotal() { 
           this.lblTotal.setText("" + this.total);
       } 
       private void makeCar() { 
          cars[nbrOfCars] = new Car("Ferrari F430", 120000.00f); 
          nbrOfCars++; 
          cars[nbrOfCars] = new Car("BMW M3", 15000.00f); 
          nbrOfCars++; 
          cars[nbrOfCars] = new Car("Benz Classic", 250000.00f); 
          nbrOfCars++; 
          cars[nbrOfCars] = new Car("Skyline GT", 30000.00f); 
          nbrOfCars++; 
       } 
    }
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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