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Oracle Certified Professional: Java SE Developer 1Z0-831 (Java SE 25) · Domain 7: Packaging and deploying Java code

Compact source files and instance main methods (Java 25), java.lang.IO

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Last reviewed September 25, 2026 · Leer en español

Java 25 finalized two features that make small programs shorter. The first is instance main methods. Traditionally the entry point had to be public static void main(String[] args). Now the launcher also accepts a main method that is not static, not public and has no parameters. The simplest valid program in a normal class is class Hello { void main() { System.out.println("Hi"); } }.

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