总结：arraycopy注意数组定义的长度。不足会补0
package clientFrame;//数组的复制arraycopy()
public class Xiang {public static void main(String[] args) {int a[] = new int[] { 2, 3, 4, 6, 7 };int b[] = new int[3];// 位数System.arraycopy(a, 0, b, 0, 3);for (int i = 0; i < b.length; i++) {System.out.print(b[i] + " ");}}
}2 3 4
