在java中设置按钮的位置和大小

import javax.swing.*;
import java.awt.*;

public class ButtonLayoutExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Button Layout Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JPanel panel = new JPanel(new FlowLayout(FlowLayout.CENTER)); // 设置对齐方式为居中
        JButton button = new JButton("Button");
        panel.add(button);
        
        frame.getContentPane().add(panel);
        frame.pack();
        frame.setVisible(true);
    }
}

import javax.swing.*;
import java.awt.*;

public class ButtonLayoutExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Button Layout Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JPanel panel = new JPanel(new BorderLayout());
        JButton button = new JButton("Button");
        panel.add(button, BorderLayout.CENTER); // 将按钮放置在中间区域
        
        frame.getContentPane().add(panel);
        frame.pack();
        frame.setVisible(true);
    }
}

import javax.swing.*;
import java.awt.*;

public class ButtonLayoutExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Button Layout Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JPanel panel = new JPanel(new GridLayout(2, 2)); // 设置为2行2列的网格布局
        JButton button1 = new JButton("Button 1");
        JButton button2 = new JButton("Button 2");
        JButton button3 = new JButton("Button 3");
        JButton button4 = new JButton("Button 4");
        panel.add(button1);
        panel.add(button2);
        panel.add(button3);
        panel.add(button4);
        
        frame.getContentPane().add(panel);
        frame.pack();
        frame.setVisible(true);
    }
}

import javax.swing.*;
import java.awt.*;

public class ButtonLayoutExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Button Layout Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        
        JButton button = new JButton("Button");
        constraints.gridx = 0; // 设置组件所在的列
        constraints.gridy = 0; // 设置组件所在的行
        constraints.gridwidth = 1; // 设置组件所占的列数
        constraints.gridheight = 1; // 设置组件所占的行数
        constraints.fill = GridBagConstraints.BOTH; // 设置组件在单元格中的填充方式
        constraints.weightx = 1.0; // 设置组件在水平方向上的拉伸权重
        constraints.weighty = 1.0; // 设置组件在垂直方向上的拉伸权重
        panel.add(button, constraints);
        
        frame.getContentPane().add(panel);
        frame.pack();
        frame.setVisible(true);
    }
}

import javax.swing.*;
import java.awt.*;

public class ButtonPositionExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Button Position Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JButton button = new JButton("Button");
        button.setBounds(100, 100, 100, 50); // 设置按钮的位置和大小
        
        frame.getContentPane().add(button);
        frame.setLayout(null); // 设置布局管理器为null
        frame.setSize(400, 300);
        frame.setVisible(true);
    }
}