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Thread: Class in class

  1. #1
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    Default Class in class

    i have this code here:

    import java.io.*
     
    public class ReadLastLine {
     
     public static void main(String[] args) throws Exception {
     
      FileInputStream in = new FileInputStream("test.txt");
      BufferedReader br = new BufferedReader(new InputStreamReader(in));
     
      String strLine = null, tmp;
     
      while ((tmp = br.readLine()) != null)
      {
         strLine = tmp;
      }
     
      String lastLine = strLine;
     
      System.out.println(lastLine);
     
      in.close();
     
     
     }
    }

    and i want to call the function lastLine in a other class, how am i supposed to do that?


  2. #2
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    Default Re: Class in class

    what you asking is not clear are you suppose to like this :
    import java.io.*;

    public class ReadLastLine {

    public static void main(String[] args) throws Exception {

    FileInputStream in = new FileInputStream("D:/123/test.txt");
    BufferedReader br = new BufferedReader(new InputStreamReader(in));

    String strLine = null, tmp;

    while ((tmp = br.readLine()) != null)
    {
    strLine = tmp;
    }

    String lastLine = strLine;

    System.out.println(lastLine);
    LastLine l = new LastLine(lastLine);

    in.close();

    }
    }

    class LastLine{
    public LastLine(String str){
    System.out.println("LastName is ------"+str);
    }
    }

  3. #3
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    Default Re: Class in class

    i have my first method

    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import java.io.*;  
     
    public class login implements ActionListener  {
     
    	//Center
    	public final JTextArea Center = new JTextArea(400, 500); //laver en final fordi ellers kan action center ikke finde værdien
     
    	public void actionPerformed(ActionEvent event) {
     
    //East
    		JPanel East = new JPanel(new GridLayout(8,2));
    		East.add(konti1);
    		East.add(new JLabel((new ReadLastLine().getValue())));     // here is where i want the last line output
    		East.add(konti2);
    		East.add(new JLabel("Tilrådighed"));
    		East.add(new JButton("Konti"));
    		East.add(new JLabel("Tilrådighed"));
    		East.add(new JButton("Konti"));
    		East.add(new JLabel("Tilrådighed"));
    		East.add(new JLabel(""));
    		East.add(new JLabel(""));
    		East.add(new JLabel(""));
    		East.add(new JLabel(""));
    		East.add(new JLabel(""));
    		East.add(new JLabel(""));
    		East.add(new JLabel(""));
    		East.add(new JLabel(""));

    and then i have my other method

    	public class readLastLine{
    		public String readLastLine(){
    		FileInputStream in = new FileInputStream("test.txt");
     	   BufferedReader br = new BufferedReader(new InputStreamReader(in));
     
     		String strLine = null, tmp;
     
     		while ((tmp = br.readLine()) != null){
         		strLine = tmp;
      		}
     
      		String lastLine = strLine;
     
      		in.close();
    		return lastLine;
     
    		}
     
    	}

    but i simple can't get it to print the last line it just comes up with a different error everytime i try

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