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");            }      }    }