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网格策略java代码 网格策略30

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

求一个网格3*3的java程序代码

效果图

参考代码

import java.awt.*;

import javax.swing.*;

public class GridFrame extends JFrame {

// 指定横向格子数量

static final int W_NUM = 3;

// 指定竖向格子数量

static final int H_NUM = 3;

// 指定每个格子的宽

static final int CELL_WIDTH = 50;

// 指定每个格子的高

static final int CELL_HEIGHT = 50;

CellPanel cp;

public GridFrame() {

cp = new CellPanel();

this.add(cp);

this.setBounds(350, 100, W_NUM * CELL_WIDTH+15 , H_NUM * CELL_HEIGHT

+ 40);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.setTitle("网格窗口");

this.setVisible(true);

}

public static void main(String[] args) {

new GridFrame();

}

class CellPanel extends JPanel {

@Override

public void paint(Graphics g) {

super.paint(g);

for (int i = 0; i  H_NUM; i++) {

for (int j = 0; j  W_NUM; j++) {

g.setColor(new Color((int) (Math.random() * 256),

(int) (Math.random() * 256),

(int) (Math.random() * 256)));

g.fill3DRect(j * CELL_WIDTH, i * CELL_HEIGHT, CELL_WIDTH,

CELL_HEIGHT, true);

}

}

}

}

}


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