Java Loops Cheat Sheet

Quick reference for for/while/do-while/enhanced for loops in Java.

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For loop

Loop from 0..4

javaANYjavaloopsfor

java

for (int i = 0; i < 5; i++) {
  System.out.println(i);
}

Classic counted loop. Great when you need an index.

javaANYjavaloopsfor

java

for (int i = 0; i < n; i++) {
  // ...
}

javaANYjavaloopsfor

java

for (int i = n - 1; i >= 0; i--) {
  // ...
}

Iterate values without index

javaANYjavaloopsforeach

java

for (String s : list) {
  System.out.println(s);
}

Use for-each when you don’t need the index.

javaANYjavaloopswhile

java

while (condition) {
  // ...
}

Executes body at least once

javaANYjavaloopsdo-while

java

do {
  // ...
} while (condition);

do-while always executes the body at least once.

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