.....
int m;
int n;
if(m==n){
i=0;}
if(m>n){
i=1;}
if(m<n){
i=2;}
switch(i);
case 0:
System.out.println("m等于n)；
break;
case 1:
System.out.println("m大于n")；
case 2:
System.out.printn("m小于n")；
switch (表达式) {
case 条件1:
语句1;
break;
case 条件2:
语句2;
break;
...
default:
语句;
}
示例
int i = 3;
int j =5;
int k = i - j;
//然后对于k进行判断三种情况，<0,>0,=0
switch (k) {
case 1:
System.out.println(1);
break;
case 2:
System.out.println(2);
break;
case 3:
System.out.println(3);
break;
default:
System.out.println(0);
}
swith(m-n)
case 0: System.out.println("等于");break;
default:{ if(m>n){System.out.println("大于");break；}else {System.out.println("小于")；break；}
}
swith(m-n)
case 0: System.out.println("等于");break;
default:{ if(m>n){System.out.println("大于");break；}else {System.out.println("小于")}
}