What does valueof mean in java

The valueOf method in Java converts a string, primitive type, or object to its corresponding wrapped type: wrap a string into a wrapper type, such as converting "123" to an Integer type. Convert a base type to a wrapper type, such as int 123 to an Integer type. Convert an object to a wrapper type, such as converting a MyObject object to the Object type.

Detailed explanation of valueOf in Java

valueOf is a commonly used static method in Java , used to convert strings, primitive types, and objects to their corresponding wrapped types.

Function

valueOf method wraps the specified value into its corresponding packaging type, such as:

• Wraps the string as String Type: String.valueOf()
• Wrap an integer as Integer Type: Integer.valueOf()
• Wrap floating point numbers as Float Type: Float.valueOf()

Usage

valueOf The syntax of the method is as follows:

public static <T> T valueOf(String value)

Among them:

• ## is the generic type of the packaging type
• value is the string value to be converted

Use case

Convert the string to a packed type

Convert the string "123" to

Integer Type:

Integer num = Integer.valueOf("123");
System.out.println(num); // 输出：123

Convert the basic type to the wrapped type

Convert the value 123 of type int to

Integer Type:

Integer num = Integer.valueOf(123);
System.out.println(num); // 输出：123

Convert object to wrapper type

Convert an object of type

MyObject to Object type:

Object obj = Object.valueOf(myObject);

Note

• valueOf method can only convert strings to wrapped types, not to primitive types.
If the provided string cannot be parsed into the target type, the
• valueOf method will throw a NumberFormatException exception.

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