🟡 Control Flow · Lesson 14

Strings in Java

A String is a sequence of characters. In Java, String is a class (not a primitive) and is immutable.

Common Methods

String s = "CodeKaFunda";
System.out.println(s.length());        // 11
System.out.println(s.toUpperCase());    // CODEKAFUNDA
System.out.println(s.charAt(0));        // C
System.out.println(s.substring(0, 4));  // Code
System.out.println(s.contains("Funda")); // true

Comparing Strings

Use .equals() to compare String content, NOT == (which compares references).

String a = "hi", b = "hi";
System.out.println(a.equals(b));  // true

Summary

String is an immutable class of characters.
Methods: length, charAt, substring, toUpperCase, contains.
Compare content with .equals(), not ==.

Java में Strings

String characters का sequence है। Java में String एक class है (primitive नहीं) और immutable है।

Common Methods

String s = "CodeKaFunda";
System.out.println(s.length());        // 11
System.out.println(s.toUpperCase());    // CODEKAFUNDA
System.out.println(s.charAt(0));        // C
System.out.println(s.substring(0, 4));  // Code
System.out.println(s.contains("Funda")); // true

Strings की तुलना

String content compare करने के लिए .equals() use करें, == नहीं (जो references compare करता है)।

String a = "hi", b = "hi";
System.out.println(a.equals(b));  // true

सारांश

String characters की immutable class है।
Methods: length, charAt, substring, toUpperCase, contains।
Content .equals() से compare करें, == से नहीं।

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