What does this print?

Answer: Score: 35 Left-to-right + with a String produces String concatenation: "Score: " + 3 = "Score: 3", then + 5 yields "Score: 35".

What does <code"Hi " + 5 + 2</code produce?

Answer: Hi 52 Left-to-right: "Hi " + 5 → "Hi 5"; + 2 → "Hi 52" (string concatenation, not addition).

Answer: Hello World The + operator concatenates the strings with a space in between.

AP Computer Science A · Topic 2.6

String Objects: Concatenation, Literals, and More Practice

Q: What does <code"Hi " + 5 + 2</code produce?

Answer: Hi 52 Left-to-right: "Hi " + 5 → "Hi 5"; + 2 → "Hi 52" (string concatenation, not addition).

Q: What is printed?

Answer: Hello World The + operator concatenates the strings with a space in between.

Part of Using Objects.

Practice questions

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Sample questions

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Sample 1difficulty 2/5
```
String s = "Score: ";
int n = 5;
System.out.println(s + 3 + n);
```
$What does this print?$
- A
  $Score: 35$
  check_circle
- B
  $Score: 8$
- C
  $Score: 53$
- D
  $Compile error$
Why
$Left-to-right + with a String produces String concatenation: "Score: " + 3 = "Score: 3", then + 5 yields "Score: 35".$
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Sample 2difficulty 2/5
$What does <code> "Hi " + 5 + 2 </code> produce?$
- A
  $7 Hi$
- B
  $Hi 52$
  check_circle
- C
  $Hi 7$
- D
  $Hi 5 2$
Why
$Left-to-right: "Hi " + 5 \to "Hi 5"; + 2 \to "Hi 52" (string concatenation, not addition).$
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Sample 3difficulty 2/5
```
String a = "Hello";
String b = "World";
System.out.println(a + " " + b);
```
$What is printed?$
- A
  $Hello+World$
- B
  $HelloWorld$
- C
  $Hello World$
  check_circle
- D
  $Hello World$
Why
$The + operator concatenates the strings with a space in between.$
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Sample 4difficulty 3/5
```
String a = "Cat";
String b = "cat";
System.out.println(a.equals(b));
```
$What is printed?$
- A
  $true$
- B
  $false$
  check_circle
- C
  $1$
- D
  $0$
Why
$equals is case-sensitive; "Cat" and "cat" differ in case, so it returns false.$
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Sample 5difficulty 3/5
$What does <code> "" + 1 + 2 + 3 </code> produce?$
- A
  $Compile error$
- B
  $6$
- C
  $123$
  check_circle
- D
  $1.2.3$
Why
$Empty string forces concatenation; result is "123".$
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