Java中的setBounds()方法有什么用？

What is the use of setBounds() method in Java?

setBounds()

setBounds()方法需要四个参数。前两个参数是左上角的x和y坐标
组件的角，第三个参数是组件的宽度，第四个参数是组件的高度。

句法

1	setBounds(int x-coordinate, int y-coordinate, int width, int height)

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import javax.swing.*;
import java.awt.*;
public class SetBoundsTest {
public static void main(String arg[]) {
JFrame frame = new JFrame("SetBounds Method Test");
frame.setSize(375, 250);
// Setting layout as null
frame.setLayout(null);
// Creating Button
JButton button = new JButton("Hello Java");
// Setting position and size of a button
button.setBounds(80,30,120,40);
frame.add(button);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}

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