How can I initialize the variable?

[Aroma Karim]

  /*  import java.awt.*;  
    import java.awt.event.*;  
    import javax.swing.*;  
      
      
    class cccc extends JFrame implements ActionListener{*/ 
    	import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class cccc extends JFrame implements ActionListener{
    JLabel StatesNature;
    JLabel Alternatives;
    JLabel Choice1;
    JLabel Choice2;
    JLabel Choice3;
    JTextField num1,num2,num3,num4,num5,num6,num7,num8,Result;
    JButton Expec; 
    /* public cccc(float Max)  
        {  
              Max.this=Max;
        }  */

    public cccc() {
    	
        ccccLayout customLayout = new ccccLayout();

        getContentPane().setFont(new Font("Helvetica", Font.PLAIN, 12));
        getContentPane().setLayout(customLayout);

        StatesNature = new JLabel("Expected returns according to States of Nature");
        getContentPane().add(StatesNature);

        Alternatives = new JLabel("Alternative Choices");
        getContentPane().add(Alternatives);

        Choice1 = new JLabel("First Project");
        getContentPane().add(Choice1);

        Choice2 = new JLabel("Second Project");
        getContentPane().add(Choice2);

        Choice3 = new JLabel("Third Project");
        getContentPane().add(Choice3);

        num1 = new JTextField();
        getContentPane().add(num1);

        num2 = new JTextField();
        getContentPane().add(num2);

        num3 = new JTextField();
        getContentPane().add(num3);

        num4 = new JTextField();
        getContentPane().add(num4);

        num5 = new JTextField();
        getContentPane().add(num5);

       num6 = new JTextField();
        getContentPane().add(num6);

        num7 = new JTextField();
        getContentPane().add(num7);

        num8 = new JTextField();
        getContentPane().add(num8);

        Expec = new JButton("Find Expected Value");
        getContentPane().add(Expec);

        Result = new JTextField();
        getContentPane().add(Result);

        setSize(getPreferredSize());

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

   

class ccccLayout implements LayoutManager {

    public ccccLayout() {
    }

    public void addLayoutComponent(String name, Component comp) {
    }

    public void removeLayoutComponent(Component comp) {
    }

    public Dimension preferredLayoutSize(Container parent) {
        Dimension dim = new Dimension(0, 0);

        Insets insets = parent.getInsets();
        dim.width = 746 + insets.left + insets.right;
        dim.height = 430 + insets.top + insets.bottom;

        return dim;
    }

    public Dimension minimumLayoutSize(Container parent) {
        Dimension dim = new Dimension(0, 0);
        return dim;
    }

    public void layoutContainer(Container parent) {
        Insets insets = parent.getInsets();

        Component c;
        c = parent.getComponent(0);
        if (c.isVisible()) {c.setBounds(insets.left+80,insets.top+8,328,24);}
        c = parent.getComponent(1);
        if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+48,72,24);}
        c = parent.getComponent(2);
        if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+88,72,24);}
        c = parent.getComponent(3);
        if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+128,72,24);}
        c = parent.getComponent(4);
        if (c.isVisible()) {c.setBounds(insets.left+8,insets.top+176,72,24);}
        c = parent.getComponent(5);
        if (c.isVisible()) {c.setBounds(insets.left+104,insets.top+48,112,24);}
        c = parent.getComponent(6);
        if (c.isVisible()) {c.setBounds(insets.left+240,insets.top+48,120,24);}
        c = parent.getComponent(7);
        if (c.isVisible()) {c.setBounds(insets.left+104,insets.top+88,112,24);}
        c = parent.getComponent(8);
        if (c.isVisible()) {c.setBounds(insets.left+240,insets.top+88,120,24);}
        c = parent.getComponent(9);
        if (c.isVisible()) {c.setBounds(insets.left+104,insets.top+128,112,24);}
        c = parent.getComponent(10);
        if (c.isVisible()) {c.setBounds(insets.left+240,insets.top+128,120,24);}
        c = parent.getComponent(11);
        if (c.isVisible()) {c.setBounds(insets.left+104,insets.top+176,112,24);}
        c = parent.getComponent(12);
        if (c.isVisible()) {c.setBounds(insets.left+240,insets.top+176,120,24);}
        c = parent.getComponent(13);
        if (c.isVisible()) {c.setBounds(insets.left+144,insets.top+216,184,40);}
        c = parent.getComponent(14);
        if (c.isVisible()) {c.setBounds(insets.left+144,insets.top+264,184,32);}
    }
}

   
      
      
    private float ExpectedValue(float M)  
    {  
        float a=Float.parseFloat(num1.getText());  
    float b=Float.parseFloat(num2.getText());         
    float d=Float.parseFloat(num4.getText());float s=Float.parseFloat(num3.getText());    
    float e=Float.parseFloat(num5.getText());  
    float f=Float.parseFloat(num6.getText());  
    float g=Float.parseFloat(num7.getText());  
    float h=Float.parseFloat(num8.getText());  
    float R1=s*a+d*b;  
    float R2=e*a+f*b;  
    float R3=g*a+h*b;  
    M=R1;  
    if(R2>M)  
    {  
    M=R2; 
    	System.out.printf("The Best Choice = %f which is the Seconed",M); 
    }else if(R3>M)  
    {  
    M=R3; 
    		System.out.printf("The Best Choice = %f which is the Third",M);  
    }  
    	else{	System.out.printf("The Best Choice = %f which is the First",M); }
    return M;}  
      
    public void actionPerformed(ActionEvent m)  
    {  
          
          
        if(m.getSource()==Expec)  
        { float c; 
            Result.setText(Float .toString(ExpectedValue( c)));  
            //System.out.printf("%f",Max);  
        }  
    }  
      
      
    public static void main(String args[]) {
        cccc window = new cccc();

        window.setTitle("Abeer");
        window.pack();
        window.show();
    }
}

--------------------Configuration: <Default>--------------------
C:\cccc.java:184: variable c might not have been initialized
Result.setText(Float .toString(ExpectedValue( c)));
^
Note: C:\cccc.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error

Process completed.

[fred rosenberger]

So here is one of your methods:

public void actionPerformed(ActionEvent m)    
{    
   if(m.getSource()==Expec)    
   { 
       float c;   
       Result.setText(Float .toString(ExpectedValue( c)));    
   }    
}

What do you mean to be passing in to the ExpectedValue() method?

[Aroma Karim]

fred rosenberger wrote:So here is one of your methods:

public void actionPerformed(ActionEvent m)    
{    
   if(m.getSource()==Expec)    
   { 
       float c;   
       Result.setText(Float .toString(ExpectedValue( c)));    
   }    
}

What do you mean to be passing in to the ExpectedValue() method?

yes that's right !

[fred rosenberger]

What do you mean by "Yes, that's right"?

'c' is a local variable to your method. Local variable do not get initialized automatically. So you have to do something like

float c = 0;

or

float c = 234.837;

or

float c = -2323.43432;

But we can't help you more than that, since we have NO idea what c is supposed to represent.