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String comparison using '==', instead of 'equals()'

Reports code that uses of == or != to compare strings.

These operators determine referential equality instead of comparing content. In most cases, strings should be compared using equals(), which does a character-by-character comparison when the strings are different objects.

Example:

void foo(String s, String t) { final boolean b = t == s; }

If t is known to be non-null, then it's safe to apply the "unsafe" quick-fix and get the result similar to the following:

void foo(String s, String t) { final boolean b = t.equals(s); }

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.16690

Last modified: 29 April 2024