IDS 201 - Characters and Strings

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10 Terms

1
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What is char?

char = character (single letter, 16-bit).


👉 Example: char c = 'A';.

2
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What number is 'A'?

'A' = 65 in Unicode.


👉 Example: char c = 65; // 'A'.

3
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What is String?

String = text (object).


👉 Example: String s = "Hello";.

4
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Can Strings be changed?

No, Strings are immutable (cannot change directly).


👉 Example: "Hi" + "!" makes a new String.

5
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First letter of "Hello"?

'H'


👉 Example: "Hello".charAt(0) = 'H'.

6
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How many letters in "Hello"?

A: 5.


👉 Example: "Hello".length() = 5

7
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"Hello".substring(0,3) = ?

"Hel".

8
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"5" + "5" = ?

"55".

9
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How turn "123" into number

Integer.parseInt("123").

10
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What does Scanner .nextLine() do?

Reads a whole line of text.


👉 Example: User types: I like Java.