JAVAWarningApril 15, 2026

Syntax Error

Syntax error on token "def", delete this token

What This Error Means

This error occurs when Java encounters a token that doesn't match the expected syntax. In this case, the word 'def' is used, which is a keyword in Python but not in Java.

Why It Happens

This error typically happens when a Java developer accidentally copies code from a Python or JavaScript project and pastes it into a Java file. The 'def' keyword is often used to define a function in other languages, but it's not a valid keyword in Java.

How to Fix It

  1. 1To fix this error, replace the 'def' keyword with a valid Java keyword, such as 'public' or 'private'. For example, if you're trying to define a method, replace 'def' with 'public' or 'private'.

Example Code Solution

❌ Before (problematic code)
Java
def myMethod() {
    System.out.println("Hello World");
}
✅ After (fixed code)
Java
public void myMethod() {
    System.out.println("Hello World");
}

Fix for Syntax error on token "def", delete this token

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