Java中的整数intValue()方法

存在于Java.lang 包中的 Integer 类的intValue()是Java中的一个内置方法，它将该整数的值作为继承自Number Class的 int 返回。包视图如下：

--> java.lang Package
    --> Integer Class
         --> intValue() Method    

句法：

public int intValue()

返回类型：转换为整数类型后由对象表示的数值。

Note: This method is applicable from java version 1.2 and onwards. 

现在我们将涵盖不同的数字，例如正数、负数、小数，甚至是字符串。

• 对于一个正整数
• 对于负数
• 对于十进制值和字符串

案例1：对于一个正整数

例子：

Java

// Java Program to Illustrate
// the Usage of intValue() method
// of Integer class
 
// Importing required class/es
import java.lang.*;
 
// Main class
public class GFG {
 
    // Main driver method
    public static void main(String[] args)
    {
 
        // Creating object of Integer class inside main()
        Integer intobject = new Integer(68);
 
        // Returns the value of this Integer as an int
        int i = intobject.intValue();
 
        // Printing the value above stored in integer
        System.out.println("The integer Value of i = " + i);
    }
}

输出：

The integer Value of i = 68

案例 2：对于一个负数

例子：

Java

// Java program to illustrate the
// use of intValue() method of
// Integer class of java.lang package
 
// Importing required classes
import java.lang.*;
 
// Main class
public class GFG {
 
    // Main driver method
    public static void main(String[] args)
    {
 
        // Creating an object of Integer class
        Integer intobject = new Integer(-76);
 
        // Returns the value of this Integer as an int
        int i = intobject.intValue();
 
        // Printing the integer value above stored on
        // console
        System.out.println("The integer Value of i = " + i);
    }
}

输出：

The integer Value of i = -76

情况 3：对于十进制值和字符串。

例子：

Java

// Java Program to illustrate
// Usage of intValue() method
// of Integer class of java.lang package
 
// Importing required classes
import java.lang.*;
 
// Main class
class GFG {
 
    // Main driver method
    public static void main(String[] args)
    {
        // Creating an object of Integer class
        Integer intobject = new Integer(98.22);
 
        // Using intValue() method
        int i = intobject.intValue();
 
        // Printing the value stored in above integer
        // variable
        System.out.println("The integer Value of i = " + i);
 
        // Creating another object of Integer class
        Integer ab = new Integer("52");
 
        int a = ab.intValue();
 
        // This time printing the value stored in "ab"
        System.out.println("The integer Value of ab = "
                           + a);
    }
}

输出：

Note: It returns an error message when a decimal value is given. For a string this works fine.