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JP Morgan Interview Question for Java Developers

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6
Answers

What is the output of following code snippet?

public static void main(String[] args){
    int[][] data = {{123},{4,5,6}};
    int[][] copy = data.clone();
    
    copy[0][0] = 100;
    
    System.out.println(data[0][0]);
    System.out.println(copy[0][0]);
    
    copy[1] = new int[]{300,400,500};
    
    System.out.println(data[1][1]);
    System.out.println(copy[1][1]);
 }

- Flash May 14, 2017 in India | Report Duplicate | Flag |
JP Morgan Java Developer Java

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Interview Type: Written Test

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3

of 3 vote

Answer:
100
100
5
400

Remember the difference between cloning a primitive and an object (an 'Array' object in this case)

- Flash May 14, 2017 | Flag Reply

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0

of 0 vote

1
100
5
400

- Anonymous May 16, 2017 | Flag Reply

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0

of 0 vote

100 // by default its shallow cloning, hence referring to the same reference.
100
5
400

- jaksnair June 11, 2017 | Flag Reply

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0

of 0 vote

It will print
123
123
5
400

- manua.2007 September 11, 2017 | Flag Reply

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0

of 0 vote

100
100
5
5

- Akash Rathore September 25, 2017 | Flag Reply

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0

of 0 vote

100
100 -- // inside integer array there is and another array which is object. hence it would be a shallow clone instead of deep.
5 -- // since we are creating new object copy[1] = new int[]{300,400,500}; now copy[1] will refer to completely new memory address and any further changes wont affect shallow clone of data.

400

Hope this helps.
Thanks

- Siddhi Parkar March 11, 2018 | Flag Reply

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0

of 0 vote

- Anonymous March 30, 2018 | Flag Reply

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