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Oracle Certified Professional: Java SE Developer 1Z0-831 (Java SE 25) · Domain 2: Controlling program flow

While, do-while, for and enhanced for loops

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Last reviewed September 25, 2026 · Leer en español

Java has four loop forms. A while loop checks its boolean condition before each iteration, so its body may run zero times. A do-while loop runs the body first and checks the condition afterwards, so its body always runs at least once. The do-while must end with a semicolon after the condition: do { ... } while (x < 3);. Leaving it out is a compile error.

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