java-如何在JPanel的顶部和底部安排JComponents

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我的程序中有三个JButton,两个JLabel和一个JTextField,以及一个带有FlowLayout的JPanel.我想在JPanel的开头安排三个按钮,其余的安排在JPanel的结尾.我需要在三个按钮和最后三个组件之间留出空间,但是代码不起作用.谁能帮我？

这是代码：

JPanel panelMenu=new Jpanel(new FlowLayout())
panelMenu.add ( btnOpen );
panelMenu.add ( lblPage );
panelMenu.add ( txtCurrentPage );
panelMenu.add ( lblTotalPage );
panelMenu.add ( btnBackword );
panelMenu.add ( btnNext );
getContentPanel.add(panelMenu);

解决方法:

FlowLayout类将组件连续放置.要获得想要的东西,可以使用GridBagLayout.

示例代码：

import java.awt.CardLayout;
import java.awt.Color;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class LayoutExamle {
    JFrame frame;
    JPanel panel;
    JButton b1, b2, b3;
    JLabel l1, l2;
    JTextField t1;

    GridBagConstraints constraints;

    public LayoutExamle(){
        initComp();
    }

    public void initComp(){
        frame = new JFrame("Example");
        frame.setLayout(new CardLayout());

        panel = new JPanel();

        panel.setSize(400, 350);
        panel.setLayout(new GridBagLayout());
        panel.setBackground(Color.WHITE);

        constraints = new GridBagConstraints();

        b1 = new JButton("<<");
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.gridwidth = 2;
        constraints.anchor = GridBagConstraints.NORTHWEST;
        constraints.insets = new Insets(12, 43, 0, 0);
        panel.add(b1, constraints);

        b2 = new JButton("Open");
        constraints.gridx = 2;
        constraints.gridy = 0;
        constraints.gridwidth = 2;
        constraints.anchor = GridBagConstraints.NORTHWEST;
        constraints.insets = new Insets(12, 18, 0, 0);
        panel.add(b2, constraints);

        b3 = new JButton(">>");
        constraints.gridx = 4;
        constraints.gridy = 0;
        constraints.anchor = GridBagConstraints.NORTHWEST;
        constraints.insets = new Insets(12, 12, 0, 0);
        panel.add(b3, constraints);

        l1 = new JLabel("jLabel1");
        constraints.gridx = 0;
        constraints.gridy = 1;
        constraints.anchor = GridBagConstraints.NORTHWEST;
        constraints.insets = new Insets(234, 43, 12, 0);
        panel.add(l1, constraints);

        l2 = new JLabel("jLabel1");
        l2.setText("jLabel2");
        constraints.gridx = 2;
        constraints.gridy = 1;
        constraints.anchor = GridBagConstraints.NORTHWEST;
        constraints.insets = new Insets(234, 18, 12, 0);
        panel.add(l2, constraints);

        t1 = new JTextField();
        constraints.gridx = 4;
        constraints.gridy = 1;
        constraints.gridwidth = 2;
        constraints.ipadx = 130;
        constraints.anchor = GridBagConstraints.NORTHWEST;
        constraints.insets = new Insets(230, 12, 12, 31);
        panel.add(t1, constraints);

        frame.add(panel);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

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

屏幕截图：

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