void in Java means that the method does not return any value and is used for method declaration (no return type is used), method invocation (no need to receive a return value), null pointer representation, wildcard type and lambda expression parameters.
The meaning of void in Java
void is a keyword in Java, mainly used in the following scenarios :
1. Method declaration
When a method does not return any value, you can use the void keyword in the method declaration instead of the return type. For example:
public void printMessage() { System.out.println("Hello, world!"); }
2. Method call
When calling a method with a return type of void, there is no need to use a variable to receive its return value. For example:
printMessage(); // 输出 "Hello, world!"
3. Other uses
void can also be used for:
- Represents a null pointer (i.e. null)
- Declare a wildcard type that does not use generics
- Indicates that there are no parameters in the lambda expression
Notes:
- If a method is declared void but actually returns a non-void value, the compiler will report an error.
- Cannot assign a value to a variable of type void or perform any operation on it.
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