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为什么我在这个程序上加入了一个Container对象就出问题了,求解答,要如何改:

package A;

import java.awt.*;

import java.applet.Applet;

public class GridBagA extends Applet

{

Container rongqi = new Container();

protected void createButton(String name, GridBagLayout gridbag, GridBagConstraints c)

{

Button button = new Button(name);

gridbag.setConstraints(button, c);

rongqi.add(button);

}

public void init()

{

GridBagLayout gridbag = new GridBagLayout();

GridBagConstraints c = new GridBagConstraints();

rongqi.setFont(new Font("无格式字体",Font.PLAIN,14));

rongqi.setLayout(gridbag);

c.fill = GridBagConstraints.BOTH;

c.weightx = 1.0;

createButton("按钮1", gridbag, c);

createButton("按钮2", gridbag, c);

createButton("按钮3", gridbag, c);

c.gridwidth = GridBagConstraints.REMAINDER;

createButton("按钮4", gridbag, c);

c.weightx = 0.0;

createButton("按钮5", gridbag, c);

c.gridwidth = GridBagConstraints.RELATIVE;

createButton("按钮6", gridbag, c);

c.gridwidth = GridBagConstraints.REMAINDER;

createButton("按钮7", gridbag, c);

c.gridwidth = 1;

c.gridheight = 2;

c.weighty = 1.0;

createButton("按钮8", gridbag, c);

c.weighty = 0.0;

c.gridwidth = GridBagConstraints.REMAINDER;

c.gridheight = 1;

createButton("按钮9", gridbag, c);

createButton("按钮10", gridbag, c);

createButton("按钮X", gridbag, c);

rongqi.setSize(300,120);

}

}

这个是原程序:

package A;

import java.awt.*;

import java.applet.Applet;

public class GridBagA extends Applet

{

protected void createButton(String name, GridBagLayout gridbag, GridBagConstraints c)

{

Button button = new Button(name);

gridbag.setConstraints(button, c);

add(button);

}

public void init()

{

GridBagLayout gridbag = new GridBagLayout();

GridBagConstraints c = new GridBagConstraints();

setFont(new Font("无格式字体",Font.PLAIN,14));

setLayout(gridbag);

c.fill = GridBagConstraints.BOTH;

c.weightx = 1.0;

createButton("按钮1", gridbag, c);

createButton("按钮2", gridbag, c);

createButton("按钮3", gridbag, c);

c.gridwidth = GridBagConstraints.REMAINDER;

createButton("按钮4", gridbag, c);

c.weightx = 0.0;

createButton("按钮5", gridbag, c);

c.gridwidth = GridBagConstraints.RELATIVE;

createButton("按钮6", gridbag, c);

c.gridwidth = GridBagConstraints.REMAINDER;

createButton("按钮7", gridbag, c);

c.gridwidth = 1;

c.gridheight = 2;

c.weighty = 1.0;

createButton("按钮8", gridbag, c);

c.weighty = 0.0;

c.gridwidth = GridBagConstraints.REMAINDER;

c.gridheight = 1;

createButton("按钮9", gridbag, c);

createButton("按钮10", gridbag, c);

createButton("按钮X", gridbag, c);

setSize(300,120);

}

}

左图为有问题程序,右图为原程序.