String Methods in Java
From the Java cheat sheet · Strings & Text Blocks · verified Jul 2026
String Methods
Common operations on immutable strings.
java
// Quick Reference
s.length() s.charAt(0)
s.toUpperCase() s.trim() s.strip()
s.substring(1, 4) s.split(",")
s.contains("x") s.replace("a", "b")💡 Strings are immutable - every "modifying" method returns a brand-new String.
⚡ Use .equals() (or .equalsIgnoreCase()) for content comparison, never ==.
📌 strip() is Unicode-aware; trim() only removes ASCII whitespace <= U+0020.
🟢 isBlank() checks for empty-or-whitespace; isEmpty() only checks length 0.
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