Question

编写Java程序，创建数组a和b，将数组a中索引位置0~3的元素复制到数组b中，最后将a和b数组中元素输出。求解

Answer 1

String[] a = {"a","b","c","d","e"};
String[] b = {"1","2","3","4","5"};
System.arraycopy(a, 0, b, 0,3);
for (int i = 0; i < a.length; i++) {
System.out.print(a[i]);
}
System.out.println();
for (int i = 0; i < b.length; i++) {
System.out.print(b[i]);

}

Answer 2

import java.util.Arrays;

public class Test{
public static void main(String[] args) {

int[] a= {35, 22, 18, 36};
int[] b = {1, 3, 5, 122};

System.out.println("Before copied, array a: " + Arrays.toString(a));
System.out.println("Before copied, array b: " + Arrays.toString(b));

b[0] = a[0];
b[1] = a[1];
b[2] = a[2];
b[3] = a[3];

System.out.println("After copied, array a: " + Arrays.toString(a));
System.out.println("After copied, array b: " + Arrays.toString(b));
}
}

Answer 3

B数组是空的？如果不是，楼上正解