Java.lang Long

1 Java.lang Long介绍

java.lang.Long 类封装了基本类型long对象的值。 long类型的对象包含单个字段类型为long。

2 Java.lang Long声明

public final class Long
   extends Number
      implements Comparable<Long>

3 Java.lang Long方法

4 Java.lang Long案例1

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
public class JavaLongExample1 {  
public static void main(String[] args) {  
    Long x1=67l;  
    Long x2=98l;  
    Long x3=6l;  
      
    // Compares two long values.  
    int b1 = Long.compare(x1, x2);  
    if(b1==0)  
    {  
   System.out.println("Both '"+x1+"' and '"+ x2+"' are same");  
    }  
    else if(b1>0)  
    {  
        System.out.println(x1+" is greater than "+x2);  
    }  
    else  
    {  
        System.out.println(x1+" is smaller than "+x2);  
    }  
      
    // Returns the hashcode for the given long value.  
System.out.println("The hashcode for the value '"+x1+"' is given as :"+x1.hashCode());  
      
    // Returns the value of long in the form of short.   
       short b2 = x3.shortValue();  
    System.out.println("The short value for '"+x2+"' is given as : "+b2);  
    }  
} 

输出结果为：

67 is smaller than 98
The hashcode for the value '67' is given as :67
The short value for '98' is given as : 6

5 Java.lang Long案例2

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
public class JavaLongExample2 {  
   public static void main(String [] args) {  
       Long x1= 45l;  
       Long x2= 67l;  
       Long x3= 12l;  
         
       // Adds the two values.  
       System.out.println("The sum of '"+x1+ "' and '"+x2+"' 'is given as :"+Long.sum(x1, x2));  
            
       // Returns the value by reversing the order of nits in 2's complement.  
       System.out.println("The reverse value  for'" +x3+ "' is given as :"+Long.reverse(x3));  
  
       // Returns the string representation.  
       String obj = x2.toString();  
       System.out.println("The string representation for '" +x2+ "' is given as : "+obj);  
   }  
} 

输出结果为：

The sum of '45' and '67' 'is given as :112
The reverse value for'12' is given as :3458764513820540928
The string representation for '67' is given as : 67