使用JPanel部署Java组件 [英] Java component deployment using JPanel

问题描述

我想要这样的组件部署:

I wanted components deployment like this picture:

我编写了一个代码，该代码在JFrame中制作两个JPanel，并将组件JPanel放在左侧.我将帧布局"设置为"BorderLayout"，将每个面板的布局"设置为"FlowLayout".但是，结果不是我想要的.甚至列表也不会出现.

I wrote a code that makes two JPanel in a JFrame and puts components JPanel on left side. I set Frame Layout to BorderLayout and Each panel's Layout to FlowLayout. However, result was not what I wanted. Even List is not appear.

结果图片:

你能告诉我该怎么做吗?

Can you tell me what to do?

下面有一个代码.

package com.java.APISearch;
import java.awt.*;
import javax.swing.*;
import javax.swing.JPanel;

public class MainFrame extends JFrame {
    JPanel search;
    JPanel result;
    JLabel ksLb;
    JTextField ksTf;
    JButton ksOK;
    JCheckBox choicePackage;
    JCheckBox choiceClass;
    JCheckBox choiceFunc;
    JTextField dsTf;
    JButton dsOK;
    JLabel rcLb;
    JList<String> rcList;
    JTextField resultTf;
    Container contentPane;

    public MainFrame(String title) {
        super(title);
        Toolkit tk = Toolkit.getDefaultToolkit();
        Dimension screenSize = tk.getScreenSize();
        setLocation(screenSize.width/2 - 300, screenSize.height/2 - 200);
        setSize(new Dimension(600, 400));
        setResizable(false);
        setLayout(new BorderLayout());
        search = new JPanel();
        result = new JPanel();
        search.setLayout(new FlowLayout(FlowLayout.LEFT));
        search.setSize(new Dimension(300,400));
        result.setLayout(new FlowLayout());
        result.setSize(new Dimension(300,400));
        contentPane = getContentPane();
        contentPane.add(search, BorderLayout.WEST);
        contentPane.add(result, BorderLayout.EAST);

        ksLb = new JLabel("키워드 검색");
        ksTf = new JTextField(20);
        ksOK = new JButton("검색");
        search.add(ksLb);
        search.add(ksTf);
        search.add(ksOK);

        choicePackage = new JCheckBox("package");
        choiceClass = new JCheckBox("class");
        choiceFunc = new JCheckBox("function");
        dsTf = new JTextField(20);
        dsOK = new JButton("검색");
        search.add(choicePackage);
        search.add(choiceClass);
        search.add(choiceFunc);
        search.add(dsTf);
        search.add(dsOK);

        rcLb = new JLabel("recent search");
        rcList = new JList<String>();
        search.add(rcLb);
        search.add(rcList);     
    }
}

推荐答案

解决复杂计算任务的常用策略是将它们分解为小型的，定义明确的可管理任务.分而治之.
这同样适用于gui:将设计分为易于布置的小容器.
在这种情况下，例如，首先将设计分为两个区域:

The common strategy to solve complex computing tasks, is to break them into small, well defined manageable tasks. Divide and conquer.
This also applies to gui: break the design into small, easy to layout containers.
In this case, for example start by dividing the design into two areas:

Serach面板添加到JFrame的NORTH，并将主面板添加到JFrame的CENTER.主面板是所有其他GUI组件的容器.在代码中查看更多信息.
这是演示该策略的框架.注意评论:

Serach panel added to JFrame's NORTH, and a main panel added to JFrame's CENTER. The main panel is a container for all other gui components. See more info in the code.
Here is a skeleton to demonstrate the strategy. Note the comments :

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class MainFrame extends JFrame {

    public MainFrame(String title) {
        super(title);
        setSize(new Dimension(600, 400));
        setResizable(false);
        //setLayout(new BorderLayout());// no need. its the default for JFrame
        JPanel search = new JPanel();
        search.setLayout(new FlowLayout(FlowLayout.LEFT));
        //search.setSize(new Dimension(300,400)); //let layout manager set size
                                                  //set preferred size if needed
        JLabel ksLb = new JLabel("Search:");
        JTextField ksTf = new JTextField(20);
        JButton ksOK = new JButton("Click Me");
        search.add(ksLb);
        search.add(ksTf);
        search.add(ksOK);
        add(search, BorderLayout.NORTH); //add search to content pane

        //construct a container to hold all the rest
        //set border layout to it
        JPanel mainPanel = new JPanel(new BorderLayout());
        //add content to mainPanel:
        //add result to NORTH 
        //add a JPanel to hold list and label to CENTER 
        add(mainPanel, BorderLayout.CENTER);//main to content pane
        setVisible(true);
    }
}

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更多应用此策略的示例: 1 3

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More examples of applying this strategy: 1 2 and 3

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