Predict the output · Java

Integer Division and String Concatenation

Easy Predict the output Seen at Oracle, Infosys, Accenture

What are the five lines of output?

What does this print?

public class Main {
    public static void main(String[] args) {
        System.out.println(7 / 2);
        System.out.println(7 / 2.0);
        System.out.println('a' + 1);
        System.out.println("" + 'a' + 1);
        System.out.println(1 + 2 + "3" + 4 + 5);
    }
}

```
3.5
3.5
b
a1
3345
```
```
3
3.5
98
a1
3345
```
```
3
3.5
98
a1
12345
```
```
3
3
b
98
3345
```

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Solution

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The output is:

7 / 2 is integer division → 3; one double operand makes it 3.5.
'a' + 1 promotes the char to int (97) → 98.
Once a String appears, + concatenates: "" + 'a' → "a", then "a1".
+ is left-associative: 1 + 2 → 3, then "33", "334", "3345".

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