java window background color setting

The window background color refers to the color displayed after directly calling the setBackground(Color color) method of JFrame or Frame.

If you call this method directly, the background color is indeed set, but what you see is not the direct JFrame or Frame, but JFrame.getContentPane(), and the contentPane on the JFrame defaults to Color.WHITE . So, no matter how you set the background color for JFrame or Frame, all you see is the contentPane.

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Solution:

Method 1: After completing the initialization, call getContentPane () method gets a contentPane container, and then sets it to invisible, that is, setVisible(false).

The code is as follows:

import javax.swing.*;
import java.awt.*
public class TestMenuBar1 {
    public static void main(String arg[]) {
        createNewMenu ck=new createNewMenu("第一个窗口");
    }
}
class createNewMenu extends JFrame{
    public createNewMenu(String title) {
        getContentPane().setVisible(false);
        setBackground(Color.blue);  //设置窗口背景颜色
        setTitle(title);
        setBounds(200,200,500,500); //设置窗口位置和大小
        setVisible(true);  //设置窗口可见
    }
}

Method 2: Directly add this.getContentPane().setBackground(Color.blue);

The code is as follows:

import java.awt.*;
import javax.swing.*;
public class TestMenuBar1 {
    public static void main(String arg[]) {
        createNewMenu ck=new createNewMenu("第一个窗口");
    }
}
class createNewMenu extends JFrame{
    public createNewMenu(String title) {
        setTitle(title);
        setBounds(200,200,500,500);
        setVisible(true);
        this.getContentPane().setBackground(Color.blue);
    }
}

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