定义一个方法copyOfRange（int[]arr,int from,int to）,将数组arr中从索引from（包含from）开始到to（不包含to）结束的元素复制到新数组中，并将新数组返回。
package demo3;
public class test6 {
public static void main(String[] args) {
int arr[]={1,2,3,4,5,6,7};
int[]copyarr=copyOfRange(arr,3,7);
for (int i = 0; i < copyarr.length; i++) {
System.out.print(copyarr[i]+" ");
}
}
public static int[] copyOfRange(int[]arr,int from,int to){
int[] newarr=new int[to-from];
int temp=0;
for (int i = from; i < to; i++) {
newarr[temp]=arr[i];
temp++;
}
return newarr;
}
}
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