我在JPanel中setSize没有作用 为什么呀?import javax.swing.*;public class SimpleFrame extends JFrame{
public SimpleFrame() {
super("Frame Title");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel p = new JPanel();
p.setSize(300, 300); //这个没有用呀,不能显示300*300的亚
setContentPane(p);
pack();
setVisible(true);
show();
}
public static void main(String[] args) {
SimpleFrame sf = new SimpleFrame();
}
}
public SimpleFrame() {
super("Frame Title");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel p = new JPanel();
p.setSize(300, 300); //这个没有用呀,不能显示300*300的亚
setContentPane(p);
pack();
setVisible(true);
show();
}
public static void main(String[] args) {
SimpleFrame sf = new SimpleFrame();
}
}
super("Frame Title");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel p = new JPanel();
setSize(300, 300); // 这个没有用呀,不能显示300*300的亚
setContentPane(p);
//pack();
setVisible(true);
show();
} public static void main(String[] args) {
SimpleFrame sf = new SimpleFrame();
}}
Causes this Window to be sized to fit the preferred size and layouts of its subcomponents. If the window and/or its owner are not yet displayable, both are made displayable before calculating the preferred size. The Window will be validated after the preferredSize is calculated. 你里面没有component,所以最小话显示了
import javax.swing.*;public class sddd extends JFrame{
public sddd() {
super("Frame Title");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300,300);
setVisible(true);
show();
}
public static void main(String[] args) {
sddd sf = new sddd();
}
}