java中网格包布局代码哪里出错？

写的时候仔细点,setLyaout方法里面有错

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lbUser=new JLabel("用户名");

gbLayout.setConstraints(tfUser,constraints);

container.add(tfUser);

你这里把 lbUser 指向了对象,此是的tfUser还没有,而你加的时候确是加的tfUser, 你把 tfUser改过来就好了

import javax.swing.*;

import java.awt.*;

public class GridBagLayoutDemo extends JFrame {

private GridBagLayout gbLayout = new GridBagLayout();

private GridBagConstraints constraints = new GridBagConstraints();

private JLabel lbUser, lbPassword;

private JTextField tfUser, tfPassword;

private JButton btnLog;

private Container container;

public GridBagLayoutDemo() {

super("网格包布局");

this.setSize(300, 200);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private void setConstraints(GridBagConstraints gbc, int row, int column,

int numRows, int numColumns, int Weightx, int Weighty) {

gbc.gridx = row;

gbc.gridy = column;

gbc.gridwidth = numRows;

gbc.gridheight = numColumns;

gbc.weightx = Weightx;

gbc.weighty = Weighty;

}

public void setLyaout() {

container = this.getContentPane();

container.setLayout(gbLayout);

// 添加用户名标签

constraints.fill = GridBagConstraints.NONE;

constraints.anchor = GridBagConstraints.CENTER;

setConstraints(constraints, 0, 0, 1, 1, 0, 0);

lbUser = new JLabel("用户名");

gbLayout.setConstraints(lbUser, constraints);

container.add(lbUser);

// 添加用户名文本框

constraints.fill = GridBagConstraints.HORIZONTAL;

setConstraints(constraints, 1, 0, 1, 1, 100, 100);

tfUser = new JTextField();

gbLayout.setConstraints(tfUser, constraints);

container.add(tfUser);

// 添加密码标签

constraints.fill = GridBagConstraints.NONE;

setConstraints(constraints, 0, 1, 1, 1, 0, 0);

lbPassword = new JLabel("密码");

gbLayout.setConstraints(lbPassword, constraints);

container.add(lbPassword);

// 添加密码文本框

constraints.fill = GridBagConstraints.HORIZONTAL;

setConstraints(constraints, 1, 1, 1, 1, 100, 100);

tfPassword = new JTextField();

gbLayout.setConstraints(tfPassword, constraints);

container.add(tfPassword);

// 添加登录按钮

constraints.fill = GridBagConstraints.CENTER;

setConstraints(constraints, 0, 2, 2, 1, 0, 0);

btnLog = new JButton("登录");

gbLayout.setConstraints(btnLog, constraints);

container.add(btnLog);

}

public static void main(String[] args) {

GridBagLayoutDemo frame = new GridBagLayoutDemo();

frame.setLyaout();

frame.show();

}

}

安卓网格布局如何用java代码实现跨多行跨多列

之前有人做过用Table来实现一个表单的效果，其中也有跨多行和多列，是用纯java代码实现的，没有使用XML。用网格布局GridView也可以实现

java有几种布局方式？

共有6中布局

FlowLayout（流式布局） Panel的默认布局

BorderLayout（边界布局）window的默认布局 Frame和Dialog

GridLayo（网格布局）

CardLayout（卡片布局）

BoxLayout（盒式布局）

null布局GridLayo（网格布局）

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