第6周作业2-IF语句大显身手之成绩判断

import javax.swing.*;public class GradeIf {public static void main (String args[]){  int x;String s=(String)JOptionPane.showInputDialog(null,"请输入成绩","学生成绩等级判断",  JOptionPane.PLAIN_MESSAGE,null,null,null);  x=Integer.parseInt(s);{if(x>=85)System.out.println("A");if(x<85&&x>=70)System.out.println("B");if(x<70&&x>=60)System.out.println("C");if(x<60)System.out.println("D");}}}