java 数组的复制

int []arrA={11,22,33,44};
        //创建一个数组
        int [] arrB=new int[5];
        System.out.println("拷贝地址（引用）之前");
        System.out.println("arrA="+arrA);
        System.out.println("arrB="+arrB);
        
        
        //引用的拷贝
        arrB=arrA;
        System.out.println("拷贝地址（引用）之后 ");
        System.out.println("arrA="+arrA);
        System.out.println("arrB="+arrB);

int [] arrA={11,22,33,44};
        int [] arrB=new int[5];
        //复制
        /*arrB[0]=arrA[0];
        arrB[1]=arrA[1];
        arrB[2]=arrA[2];
        arrB[3]=arrA[3];*/
        System.out.println("赋值之前");
        for(int i=0;i<arrB.length;i++){
            System.out.print(arrB[i]+"\t");
        }
        //两个数组的长度的最小值
        int length=Math.min(arrA.length, arrB.length);
        for(int i=0;i<length;i++){
            arrB[i]=arrA[i];
        }
        //遍历arrB数组
        System.out.println("\n赋值之后");
        for(int i=0;i<arrB.length;i++){
            System.out.print(arrB[i]+"\t");
        }

        int [] arrA={11,22,33,44};//源数组
        int [] arrB=new int[5];//目标数组
        
        System.out.println("数组拷贝之前");
        for(int num:arrB){
            System.out.print(num+"\t");
        }
        //拷贝
        System.arraycopy(arrA, 0, arrB, 1, 2);　　//从arrA从下标0开始拷贝，拷贝给arrB从下标1开始，拷贝的长度为2 arrB的元素为[0,11,22,0,0]
        
        System.out.println("\n数组拷贝之后");
        for(int num:arrB){
            System.out.print(num+"\t");
        }