Java 窗体居中 通用代码

    Toolkit kit = Toolkit.getDefaultToolkit();    // 定义工具包
    Dimension screenSize = kit.getScreenSize();   // 获取屏幕的尺寸
    int screenWidth = screenSize.width/2;         // 获取屏幕的宽
    int screenHeight = screenSize.height/2;       // 获取屏幕的高
    int height = this.getHeight();
    int width = this.getWidth();
    
    setLocation(screenWidth-width/2, screenHeight-height/2);

当然，如果编译不过的话请确认你有无引用以下三个包

import javax.swing.JFrame;
import java.awt.Toolkit;
import java.awt.Dimension;