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Thread: Simple java method problem

  1. #1
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    Default Simple java method problem

    I have a problem with my program. I am trying to call a method from a secondary class in the main class.
    Whenever I debug the Test class I only get the text output "hello, Im the Test class!" or "hello Im the TestCall Class!" when I run the TestCall class.

    I want it to display either one of the two text outputs and the text "I am method showMessage from class Test!"

    This is the main class
    public class Test{
     
    public static void main(String args[])
    {
    System.out.println("hello, Im the Test class!");
    }
     
    public void showMesage(){
    System.out.println("I am method showMessage from class 
     
    Test!");
    }
    }

    And this is the secondary class:

    public class TestCall{
     
    public static void main(String args[])
    {
    System.out.println("hello Im the TestCall Class!");
    }
     
    public void run(){
    Test t = new Test(); // create an instance
    t.showMesage(); // use t to refer any method of class Test
    }
    }

    The first code I made had no:
    public static void main(String args[])
    {
    System.out.println("hello Im the TestCall Class!");
    }

    Then I received an error message when I tried to debug it: "Exception in thread "main" java.lang.NoSuchMethodError: main"


  2. #2
    Super Moderator copeg's Avatar
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    Default Re: Simple java method problem

    See Defining Methods (The Java™ Tutorials > Learning the Java Language > Classes and Objects) To call a method, you must call the method. For example, in the second to last piece of code, call run() in the main method to run that piece of code.

  3. #3
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    Default Re: Simple java method problem

    I tried to do it this way but it still wont work.

    Main class:
    public class Test
    {
    public static void main(String args[])
    {
    System.out.println("hello Im the Test Class!");
    }
     
    public void run(){
    TestCall t = new TestCall(); // create an instance
    t.showMesage(); // use t to refer any method of class Test
    }
    }

    Secondary class:
    public class TestCall
    {
    public static void main(String args[])
    {
    System.out.println("hello, Im the TestCall class!");
    showMesage();
    }
     
    public static void showMesage()
    {
    System.out.println("I am method showMessage class 
     
    TestCall!");
    }
    }

    What I just did was compile the secondary class first, then i compiled the main class and ran the main class. It still wont call the method.
    I'm sure I'm doing a lot wrong here....
    And thanks for your reply

  4. #4
    Super Moderator copeg's Avatar
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    Default Re: Simple java method problem

    I'm not sure what you wish to run...both classes have a main method. Stick to a single main method and run the code from there.

  5. #5
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    Default Re: Simple java method problem

    Okay... So I finally got it to work. I don't know though if this is the appropriate way of doing it.
    Here's my code, please tell me what you think.

    Main class:
    public class Test extends TestCall
    {
    public static void main(String args[])
    {
    Test nt=new Test();
    TestCall t = (TestCall)nt;
    t.showMesage();
    }
    }

    Secondary class:
    public class TestCall
    {
    public static void showMesage()
    {
    System.out.println("I am method showMessage class 
     
    TestCall!");
    }
    }

  6. #6
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    Default Re: Simple java method problem

    There is no reason for Test to extend TestCall.
    public class Test {
        public static void main(String args[]) {
            TestCall t = new TestCall();
            t.showMesage();
        }
    }

    Also, the showMessage method should not be static.

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