数组拷贝---System.arraycopy()

1. System.arraycopy()

arraycopy(Object src,int srcPos,Object dest,int destPos,int length)

param：
src： the source array.
srcPos： starting position in the source array.
dest： the destination array.
destPos： starting position in the destination data.
length： the number of array elements to be copied.

2. 代码

public class TestCopy {
    
    
    public static void main(String[] args) {
    
    
        int[] array1 = {
    
    1, 0, 0, 0, 1};
        int[] array2 = new int[array1.length+2];
        array2[0]=0;
        array2[array1.length+1]=0;
        System.arraycopy(array1,0,array2,1,array1.length);
        System.out.println(Arrays.toString(array2));  //[0, 1, 0, 0, 0, 1, 0]
    }
}