Java get number type

Java get number type

The abstract class Number is the superclass of platform classes representing numeric values that are convertible to the primitive types byte , double , float , int , long , and short . The specific semantics of the conversion from the numeric value of a particular Number implementation to a given primitive type is defined by the Number implementation in question. For platform classes, the conversion is often analogous to a narrowing primitive conversion or a widening primitive conversion as defined in The Java™ Language Specification for converting between primitive types. Therefore, conversions may lose information about the overall magnitude of a numeric value, may lose precision, and may even return a result of a different sign than the input. See the documentation of a given Number implementation for conversion details.

Constructor Summary

Method Summary

Methods declared in class java.lang.Object

Constructor Detail

Number

Method Detail

intValue

public abstract int intValue()

longValue

public abstract long longValue()

floatValue

public abstract float floatValue()

doubleValue

public abstract double doubleValue()

byteValue

Returns the value of the specified number as a byte . This implementation returns the result of intValue() cast to a byte .

shortValue

Returns the value of the specified number as a short . This implementation returns the result of intValue() cast to a short .

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Java get number type

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Java typeof Operator

1. Get the Type of a Variable/Value in Java
2. Get the Type of Any Variable/Value in Java

This tutorial introduces how to get the data type of a variable or value in Java and lists some example codes to understand the topic.

In Java, to get type of a variable or a value, we can use getClass() method of Object class. This is the only way to do this, unlike JavaScript with the typeof() method to check type.

Since we used the getClass() method of Object class, it works with objects only, not primitives. If you want to get the type of primitives, then first convert them using the wrapper class. Let’s understand with some examples.

Get the Type of a Variable/Value in Java

In this example, we used getClass() to check the type of a variable. Since this variable is a string type, then we can directly call the method. See the example below.

Notice that the getClass() method returns a fully qualified class name, including a package name such as java.lang.String in our case.

public class SimpleTesting  public static void main(String[] args)  String msg = "Hello";  System.out.println(msg);  System.out.println("Type is: "+msg.getClass());  > > 

Hello Type is: class java.lang.String 

Get the Type of Any Variable/Value in Java

In the above example, we used a string variable and got its type similarly; we can also use another type of variable, and the method returns the desired result. See the example below.

In this example, we created two more variables, integer and character, apart from string and used the getClass() method.

package javaexample; public class SimpleTesting  public static void main(String[] args)  String msg = "Hello";  System.out.println(msg);  System.out.println("Type is: "+msg.getClass());  // Integer  Integer val = 20;  System.out.println(val);  System.out.println("Type is: "+val.getClass());  // Character  Character ch = 'G';  System.out.println(ch);  System.out.println("Type is: "+ch.getClass());  > > 

Hello Type is: class java.lang.String 20 Type is: class java.lang.Integer G Type is: class java.lang.Character 

The getClass() method returns a complete qualified name of the class, including the package name. If you wish to get only the type name, you can use the getSimpleName() method that returns a single string. See the example below.

package javaexample; public class SimpleTesting  public static void main(String[] args)  String msg = "Hello";  System.out.println(msg);  System.out.println("Type is: "+msg.getClass().getSimpleName());   // Integer  Integer val = 20;  System.out.println(val);  System.out.println("Type is: "+val.getClass().getSimpleName());   // Character  Character ch = 'G';  System.out.println(ch);  System.out.println("Type is: "+ch.getClass().getSimpleName());  > > 

Hello Type is: String 20 Type is: Integer G Type is: Character 

Related Article — Java Operator

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