In Java, which three of the following are valid char declarations or assignments?

Introduction / Context:
Java char is a 16-bit unsigned UTF-16 code unit. It can be initialized by a single-quoted character, a Unicode escape within single quotes, or an integral literal within range 0..65535.

Given Data / Assumptions:

• c1 = 064770; c2 = 'face'; c3 = 0xbeef; c4 = \u0022; c5 = '\iface'; c6 = '\uface'
• Octal/hex integer literals are allowed if in range; Unicode escapes must be within single quotes to form a char literal.

Concept / Approach:
Legal forms: char c = 'A'; char c = '\u0041'; char c = 65; Illegal forms include multi-character literals and missing quotes around Unicode escapes.

Step-by-Step Solution:

Verification / Alternative check:
Compile each line independently; only 1, 3, and 6 succeed without additional casts.

Why Other Options Are Wrong:
They include invalid forms (multi-char literal, missing quotes, or illegal escape).

Common Pitfalls:
Forgetting quotes around Unicode escapes; misusing escapes; assuming char can hold strings.

Final Answer:
1, 3, 6