JButton没有出现在JFrame上 [英] JButton not appearing on JFrame

问题描述

以下是jbutton未显示在框架上的代码.我也将visible设置为true.即使那样，按钮也不会出现.

Following is the code in which the jbutton is not showing on the frame. I have also set visible to true. Even then the button doesn't appear.

class gui{
        public static void main(String args[]){
            layoutBorder lb=new layoutBorder("check");
        }
    }

class layoutBorder extends JFrame{
    layoutBorder(String title){
        super(title);
        setLayout(null);
        setSize(200, 200);
        JButton jb=new JButton("JB");
        add(jb);
        setVisible(true);
    }
}

推荐答案

如果要使用null布局，则需要自己设置尺寸和位置.使用setLocation和setSize方法.

If you want null layouts then you need to set sizes and position by yourself. Using the setLocation and setSize methods.

class gui{
        public static void main(String args[]){
            layoutBorder lb=new layoutBorder("check");
        }
    }

class layoutBorder extends JFrame{
    layoutBorder(String title){
        super(title);
        setLayout(null);
        setSize(200, 200);
        JButton jb=new JButton("JB");
        jb.setLocation(10, 10);
        jb.setSize(40, 30);
        add(jb);
        setVisible(true);
    }
}

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