程序出现错误 那位大哥给小弟教一下
import javax.swing.JOptionPane;
public class switch_
{
public static void main(String args[])
{
String str;
int chengji;
str=JOtionPane.showInputDialog("输入成绩");
chengji=Integer.parseInt(str);
switch(chengji)
{

case 00-59: System.out.println("E级");break;
case 60-69: System.out.println("D级");break;
case 70-79: System.out.println("C级");break;
case 80-89: System.out.println("B级");break;
case 90-100: System.out.println("A级");break;
}

}
}



编译时出现 1 找不到符号位
  2 case标签重复

------解决方案--------------------

Java code

import javax.swing.JOptionPane; 
public class Test 
{ 
public static void main(String args[]) 
{ 
String str; 
int chengji; 
str=JOptionPane.showInputDialog("输入成绩"); //是JOptionPane类
chengji=Integer.parseInt(str);
chengji/=10; //修改
switch(chengji) 
{ 


case 6: System.out.println("D级");break; 
case 7: System.out.println("C级");break; 
case 8: System.out.println("B级");break; 
case 9: 
case 10:
    System.out.println("A级");break;
default: 
    System.out.println("E级");
} 

} 
}