What does var mean in java

In Java, the var keyword is used for local variable type inference. The compiler automatically infers the type based on the initial value of the variable, simplifying the code and preventing type errors.

The meaning of var in java

In Java, var is a local variable Type inference keyword. It allows the compiler to infer the type of a variable when it is declared, rather than specifying the type explicitly.

Usage

When using var to declare a variable, you need to follow the following syntax:

var variableName = value;

Among them:

• variableName is the name of the variable.
• value is the initial value of the variable.

The compiler will infer the type of the variable based on the type of value. For example:

var number = 10; // int 类型
var name = "John"; // String 类型

Benefits

Using var has the following benefits:

• Improve code simplicity : No need to manually specify variable types, making the code more concise.
• Prevent type errors: The compiler checks whether the variable type is compatible with the value to avoid type errors.
• Enhance readability: var The keyword indicates that the type of the variable is obvious, enhancing the readability of the code.

Note

• var can only be used for local variables, not class member variables or method parameters.
• var keyword is supported starting with Java 10.
• For complex data types, explicitly specifying the type is still a better choice to improve the maintainability of the code.

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