数组扩容

package com.atsico.pkg0822.pg03;

public class RunMain {

static int[] iArr = new int[]{1, 0, 2, 3, 4};

public static int[] addArrayLength(int[] iArr) {
    int[] newArr = new int[iArr.length * 2];
    System.arraycopy(iArr, 0, newArr, 0, iArr.length);
    return newArr;
}

public static void main(String[] args) {
    System.out.println("扩容前的数组长度：" + iArr.length);
    iArr = addArrayLength(iArr);
    int count = 0;
    System.out.println("扩容后的数组长度：" + iArr.length);
    for (int mem : iArr) {
        count++;
        System.out.println(count + " : " + mem);
    }
}

}