java ... and :，

java ... and :，

package mypackage;


public class Exchange {
static int maxArray(int[] arr){//此处方法调用时只能传入整形数组
int result = 0;
for(int i=0;i<arr.length;i++)
if (result < arr[i])
result = arr[i];
return result;
}

static int maxArray1(int... arr){//此处调用时会将参数默认为数组，不需要额外处理。类似于c#的static int maxArray1(params int[] arr)
int result = 0;
for(int i=0;i<arr.length;i++)
if (result < arr[i])
result = arr[i];
return result;
}

static int maxArray2(int... arr){
int result = 0;
for(int b : arr)     //b:arr 就是foreach语句。
if (result < b)
result = b;
return result;
}


public static void main(String[] args) {
int pr = maxArray(new int[]{1,121,11,222});
System.out.println(pr);
int pr1 = maxArray1(1,121,11,222);
System.out.println(pr1);
int pr2 = maxArray2(1,121,11,222);
System.out.println(pr2);
}


}