Print an array like an object in Java

Question

I konw that an array is an object in Java. I want to print one array like other objects but this won't work:

public static Object[] join(Object[] obj1,Object[] obj2)
{
    Object[] sum=new Object[obj1.length+obj2.length];
    int i=0;
    for(;i<obj1.length;i++)
    {
        sum[i]=obj1[i];
    }
    for(int j=0;j<obj2.length;j++,i++)        {
        sum[i]=obj2[j];
       // i++;
    }
    return sum;
}

public static void main(String[] args) {
    // TODO code application logic here
    int[] array={1,2,3,4,5};
    Object[] obj1={"Nguyen Viet Q",28,"Doan Thi Ha",array};
    Object[] obj2={"Nguyen Viet Q1",28,"Doan Thi Ha1"};
    join(obj1,obj2);
    for(Object o: join(obj1,obj2))
    {
        System.out.print(o.toString()+" ");// i want to print array object
    }        
}

Can anybody please help me?

What are you trying to achieve by inserting reference variable array in line:Object[] obj1={"Nguyen Viet Quan",28,"Doan Thi Ha",array};? — akhil_mittal
– akhil_mittal, Commented Sep 22, 2015 at 4:35

Elliott Frisch · Accepted Answer · 2015-09-22 04:46:22Z

3

First your join method only needs one loop to copy obj2 as well as obj1. You could find the maximum length for your loop test. And then copy on each valid index. That might look something like

public static Object[] join(Object[] obj1, Object[] obj2) {
    Object[] sum = new Object[obj1.length + obj2.length];
    int len = Math.max(obj1.length, obj2.length);
    for (int i = 0; i < len; i++) {
        if (i < obj1.length) {
            sum[i] = obj1[i];
        }
        if (i < obj2.length) {
            sum[i + obj1.length] = obj2[i];
        }
    }
    return sum;
}

Then you need to save a reference to your joined obj (or print it directly). And because it contains a nested array, you might choose Arrays.deepToString(Object[])

public static void main(String[] args) {
    int[] array = { 1, 2, 3, 4, 5 };
    Object[] obj1 = { "Nguyen Viet Quan", 28, "Doan Thi Ha", array };
    Object[] obj2 = { "Nguyen Viet Quan1", 28, "Doan Thi Ha1" };
    System.out.println(Arrays.deepToString(join(obj1, obj2)));
}

which outputs (formatted for this post)

[Nguyen Viet Quan, 28, Doan Thi Ha, [1, 2, 3, 4, 5], 
    Nguyen Viet Quan1, 28, Doan Thi Ha1]

edited Sep 22, 2015 at 4:46

answered Sep 22, 2015 at 4:41

Elliott Frisch

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1 Comment

akhil_mittal Over a year ago

The code for join proposed by OP also works and the only change needed is to print multi-dim array using deepToString.

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