题目内容

本题程序的功能是使用GridBayLayout来组织窗口上的按钮。窗口中共有7个按钮，前3个按钮放置在第1排，第4个按钮独占第2排，第6个按钮位于第3排的右侧，而第5和第7个按钮共同处于第3排的左侧。请将下述程序补充完整(注意：不得改动程序的结构，不得增行或删行)。 import javax.swing.; import java.awt.; import java.awt.event.*; public class simple extends Jframe private JPanel jpanel1=new JPanel(); private GridLayout g1; private JButton JButton1 = new JButton("第一个"); private JButton JButton2 = new JButton("第二个"); private JButton JButton3 = new JButton("第三个"); private JButton JButton4 = new JButton("第四个"); private JButton JButton5 = new JButton("第五个"); private JButton JButton6 = new JButton("第六个"); private JButton JButton7 = new JButton("第七个"); public () super("simple"); setSize(300,150); GridBagLayout gbl= ; jpanell.setLayout(gbl); GridBagConstraints gbc = new GridBagConstraints(); gbc.fill = GridBagConstraints.BOTH; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.gridx = 0; gbc.gridy = 0; jpanell.add(JButtonl,gbc); gbc.gridx = 1; jpanell.add(JButton2,gbc); gbc.gridx = 2; jpanell.add(JButton3,gbc); gbc.gridx = 0; gbc.gridy = 1; gbc.gridwidth = 3; jpanell.add(JButton4,gbc); gbc.gridy = 2; gbc.gridwidth = 1; jpanell.add(JButton5,gbc); gbc.gridx = 1; gbc.gridwidth = 2; gbc.gridheight = 2; jpanell.add(JButton6,gbc); gbc.gridx = 0; gbc.gridy = 3; gbc.gridwidth = 1; gbc.gridheight = 1; jpanell.add(JButton7,gbc); this.setContentPane (jpanel1); public static void main (String args[]) simple fgl= new simple(); fgl.show(); fgl.addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) System.exit(0); );

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