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Java find output programs (Arrays) | set 2

Find the output of Java programs | Arrays | Set 2: Enhance the knowledge of Java Arrays concepts by solving and finding the output of some Java programs.
Submitted by Nidhi, on January 30, 2021

Question 1:

public class Main
{
     public static void main(String []args)
     {
        int arr[]={5,3,1,6,2};
        
        int val=0;

        val = arr[0];
        for(int i=1; i<=arr.length;i++)
        {
            if (val > arr[i])
                val = arr[i];
        }

        System.out.println(val);
     }
}

Output:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5
        at Main.main(Main.java:12)

Explanation:

The above program will generate runtime exception because arr.length will return 5, and the highest index of the array is 4 but we are trying to access the element at index 5, which is out of bounds of the array.

Question 2:

public class Main
{
     public static void main(String []args)
     {
        int arr[]={5,3,1,6,2};
        
        int val=0;

        val = arr[0];
        for(int i=1; i<arr.length;i++)
        {
            if (val < arr[i])
                val = arr[i];
        }

        System.out.println(val);
     }
}

Output:

6

Explanation:

In the above program, we created an integer array that contains 5 elements, and an integer variable val with initial value 0.

val = arr[0];

Here, we assigned the first value of array that is 5 to the variable val. Here, we find the largest element from the array. here we compare variable val with each item of the array and assign a greater value into the variable val and finally val contains the largest value, that will be printed on the console screen.

Question 3:

public class Main
{
     public static void main(String []args)
     {
        int arr[]={5,3};
        
        int val=0;

        arr = new int[5];
        
        val = arr[0];
        for(int i=1; i<arr.length;i++)
        {
            if (val < arr[i])
                val = arr[i];
        }

        System.out.println(val);
     }
}

Output:

0

Explanation:

In the above program, we created an integer array initialized with 5, 3. After that, we reallocated the array using a new operator that's why all 5 elements initialized with 0 then the final value of variable val will be 0.

Question 4:

public class Main
{
     public static void main(String []args)
     {
        int myArray[][];
        int P,Q;
        
        myArray = new int[2][2];

        for (int P = 0; P < 2; P++)
        {
            for (Q = 0; Q < 2; Q++)
                myArray[P][Q] = P + Q;
        }

        for (P = 0; P < 2; P++)
        {
            for (Q = 0; Q < 2; Q++)
                System.out.println(myArray[P][Q] + " ");
        }

     }
}

Output:

Main.java:10: error: variable P is already defined in method main(String[])
        for (int P = 0; P < 2; P++)
                 ^
1 error

Explanation:

The above program will generate syntax error because we declare a local variable P and then we re-define variable P in the for loop that's why error gets generated in the program.

Question 5:

public class Main
{
     public static void main(String []args)
     {
        int arr[][] = new int[][] 
                    {
                        new int[] {21, 22, 23, 24},
                        new int[] {25, 26},
                        new int[] {27, 28,29},
                        new int[] {30, 31,32,33,34}
                    };

        for (int I = 0; I < arr.length; I++)
        {
            for (int J = 0; J < arr[I].length; J++)
                System.out.print(arr[I][J] + " ");
            System.out.println();
        }
     }
}

Output:

21 22 23 24 
25 26 
27 28 29 
30 31 32 33 34 

Explanation:

In the above program, we created a two-dimensional jagged array. As we know that a two-dimensional jagged array contains the different number of elements in the different rows.

for (int I = 0; I < arr.length; I++)
{
    for (int J = 0; J < arr[I].length; J++)
        System.out.print(arr[I][J] + " ");
    System.out.println();
}

Here, the nested loop is used to print elements of a jagged array. Here, we used length data member with a row index, which is given below. Because every row may have a different number of elements.

arr[i].length


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