JPanel 填充所有 JFrame 空间 [英] JPanel fills all JFrame space

问题描述

我已经编写了这段代码来显示面板中的一些颜色:

I have write this code for displaying some set of colors from panel:

import java.util.ArrayList;
import java.util.List;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Palette {

    public static void main(String[] args) {
        JFrame frame = new JFrame("Panel");

        palette.add(new Color(255, 0, 0));
        palette.add(new Color(0, 255, 0));
        palette.add(new Color(0, 0, 255));

        int width = 100;
        int height = 250;
        int x = 0;
        for (Color color : palette) {
            JPanel panel = new JPanel();

            panel.setSize(width, height);
            panel.setLocation(x, 750);
            panel.setBackground(new java.awt.Color(color.getColor()));

            frame.add(panel);

            x+=width;
        }
        frame.pack();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(1000, 1000);
        frame.setVisible(true);
    }

}

两个前面板在正确的位置和正确的尺寸.但最后一个用蓝色填充所有帧.怎么了?

Two first panels in the right place and with right dimensions. But the last one fills all frame in blue color. What's wrong?

推荐答案

你必须使用合适的布局管理器.默认情况下，JFrame 具有 BorderLayout.

You have to use the appropriate Layout Manager. A JFrame by default has a BorderLayout.

查看 LayoutManagers 教程:

Check out this tutorial for LayoutManagers:

http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html

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