public class Tester { private int x; private int y; public static void main(String[] args) { Tester t1 = new Tester(); t1.x = 2; t1.y = 3; Tester t2 = new Tester(); t2.x = 4; t2.y = 7…

The correct answer is C. 23.47. Option C is correct because the expression t1.x + "" + t1.y uses string concatenation, not arithmetic addition. Java evaluates left to right, so 2 + "" produces the string "2", then "2" + 3 produces "23" - the digits are joined as text, not summed. The same logic applies to t2…

Working with Java Data Types

Question

public class Tester {
private int x;
private int y;
public static void main(String[] args) {
Tester t1 = new Tester();
t1.x = 2;
t1.y = 3;
Tester t2 = new Tester();
t2.x = 4;
t2.y = 7;
System.out.println(t1.x + "" + t1.y);
System.out.println(t2.x + "" + t2.y);
}
}
What is the result?

Options

A2.34.5
B2.34.7
C23.47
D24.3.5

How the community answered

(43 responses)

A
7% (3)
B
2% (1)
C
74% (32)
D
16% (7)

Explanation

Option C is correct because the expression t1.x + "" + t1.y uses string concatenation, not arithmetic addition. Java evaluates left to right, so 2 + "" produces the string "2", then "2" + 3 produces "23" - the digits are joined as text, not summed. The same logic applies to t2, producing "47", and since println is called twice, the output appears on two separate lines: 23 then 47.

Options A, B, and D are distractors that mix up values between the two objects or swap field assignments - for example, implying t1.y is 5 or t2.y is 5, neither of which is true based on the code. Option B gets t2.y = 7 right but still shows 2.3 for the first line, which would only be correct if the values were printed with a decimal separator rather than concatenated.

Memory tip: Whenever you see int + "" + int in Java, mentally replace "" with a sticky note - it "sticks" the numbers together as strings rather than adding them mathematically. If the "" weren't there, you'd get arithmetic; with it, you get text glued side by side.

Topics

#string concatenation#type coercion#operator precedence#primitive types

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