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

问题描述

我已经编写了这段代码，用于显示面板中的某些颜色:

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);
    }

}

在正确的位置和正确的尺寸放置两个前面板.但是最后一个将所有帧填充为蓝色.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

您必须使用适当的布局管理器.默认情况下，JFrame的BorderLayout.

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

查看本教程的LayoutManagers:

Check out this tutorial for LayoutManagers:

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

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