java怎么把数组的元素个数_想问一下怎样才可以把一个数 放在已知数组里面

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import java.util.Arrays;

public class Test

{

public static void main(String... args)

{

int[] int1dSrc = new int[]{ 1, 2, 3 };

System.out.println("int1dSrc: " + int1dSrc + ": " + Arrays.toString(int1dSrc));

int[] int1dCache = int1dSrc;

System.out.println("int1dCache: " + int1dCache + ": " + Arrays.toString(int1dCache));

System.out.println((int1dSrc == int1dCache) ? "int1dSrc == int1dCache" : "int1dSrc != int1dCache");

int[] int1dSrc = Arrays.copyOf(int1dSrc, int1dSrc.length + 1);

System.out.println("int1dSrc: " + int1dSrc + ": " + Arrays.toString(int1dSrc));

System.out.println("int1dCache: " + int1dCache + ": " + Arrays.toString(int1dCache));

System.out.println((int1dSrc == int1dCache) ? "int1dSrc == int1dCache" : "int1dSrc != int1dCache");

}

}

int1dSrc: [I@7d772e: [1, 2, 3]

int1dCache: [I@7d772e: [1, 2, 3]

int1dSrc == int1dCache

int1dSrc: [I@7d776c: [1, 2, 3, 0]

int1dCache: [I@7d772e: [1, 2, 3]

int1dSrc != int1dCache

自己去读 Arrays.copyOf(...) 的 API 。