在窗口上打印数字数组

Question

Hello I am new to java graphics and just experimenting with things but I am puzzled with how I can display the numbers in an array on my created window? I am not sure if it works the same as text or not?

import java.util.Scanner;
import javax.swing.JFrame;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;


public class area extends JFrame{


    int[] myArray;
    myArray = new int[3];
    myArray[0] = 1;
    myArray[1] = 2;
    myArray[2] = 3;

JTextArea area = new JTextArea();
for (int i=0; i<myArray.length; i++)
{
    area.append(myArray[i]+"\n");
}
add(area);  


public static void main(String args[]) {

area gui = new area(); 
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setSize(400,200);
gui.setVisible(true);
}
}

Answer 1

Use a JTextArea and you can save your array as a string

String text;
for(int w : array) {
   w=Integer.toString(w);
   text+=w;
}

Answer 2

You can use a JTextArea.

JTextArea ta = new JTextArea();
for (int i=0; i<array.length; i++)
{
    ta.append(array[i]+"\n");
}
add(ta);

Answer 3

Are you using an IDE like eclipse? If not might help. Looks like part of your code is in the wrong place. Instead of constructor or init method its just below the var declerations. IDE will help you with that. Also go thru (patiently) some more basic tutorials and look at small existing code.

Following code worked for me small edit to yours near //constructor

    import java.util.Scanner;
    import javax.swing.JFrame;
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;

    //put in a file called area.java
    public class area extends JFrame{


            int[] myArray;
            JTextArea area = new JTextArea();
     //constructor 
     area(){
            myArray = new int[3];
            myArray[0] = 1;
            myArray[1] = 2;
            myArray[2] = 3;




    for (int i=0; i<myArray.length; i++)
    {
            area.append(i + " " + myArray[i]+"\n");
    }
    add(area);

       }
    public static void main(String args[]) {

         area gui = new area();
         gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         gui.setSize(400,200);
         gui.setVisible(true);
       }
    }