Java Random nextInt（）方法与示例

朱雀 2023-03-05 12:59 148阅读 0赞

## 随机类nextInt()方法 **(**Random Class nextInt() method**)** ##

**Syntax:**

**句法：**

public int nextInt();
        public int nextInt(int num);

*  **nextInt() method** is available in java.util package.
    
    **nextInt()方法**在java.util包中可用。
 *  **nextInt() method** is used to return the next pseudo-random value from this Random Value Generator.
    
    **nextInt()方法**用于从此随机值生成器返回下一个伪随机值。
 *  **nextInt(int num) method** is used to return the next pseudo-random distribute integer value between 0 and the given parameter (num) from this Random Generator.
    
    **nextInt(int num)方法**用于从此随机数生成器返回下一个介于0和给定参数(num)之间的下一个伪随机分布整数值。
 *  These methods may throw an exception at the time of returning the next integer value.
    
    这些方法在返回下一个整数值时可能会引发异常。
    
    **IllegalArgumentException**: This exception may throw when the given parameter (num<0) is invalid.
    
    **IllegalArgumentException** ：当给定参数(num <0)无效时，可能引发此异常。
 *  These are non-static methods and it is accessible with the class object and if we try to access these methods with the class name then also we will get any error.
    
    这些是非静态方法，可通过类对象进行访问，如果尝试使用类名访问这些方法，则也会遇到任何错误。

**Parameter(s):**

**参数：**

*  In the first case, **nextInt()**
    
    在第一种情况下， **nextInt()**
    
     *  It does not accept any parameter.
 *  In the second case, **nextInt(int num)**
    
    在第二种情况下， **nextInt(int num)**
    
     *  int num – represents the last endpoint of this Random Value Generator.
     *  int num –表示此随机值生成器的最后一个端点。

**Return value:**

**返回值：**

In both the cases, the return type of the method is int – it returns next pseudorandom distributed value between 0 and num.

在这两种情况下，方法的返回类型均为int –它返回0至num之间的下一个伪随机分布值。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of nextInt() method of Random
    
    import java.util.*;
    
    public class NextIntOfRandom {
        
     public static void main(String args[]) {
        
      // Instantiates Random object
      Random ran = new Random();
    
      // By using nextInt() method is
      // to return next int pseudo-random
      // value by using Random Value Generator
      int val = ran.nextInt();
    
      // Display val
      System.out.println("ran.nextInt(): " + val);
    
      // By using nextInt(int) method is
      // to return next int pseudo-random
      // value between 0 and the given value
      // and 0 is inclusive whereas the given value 
      // is exclusive by using Random Value Generator
      val = ran.nextInt(50);
    
      // Display val
      System.out.println("ran.nextInt(50): " + val);
     }
    }

**Output**

**输出量**

RUN 1:
    ran.nextInt(): -1450643138
    ran.nextInt(50): 13
    
    RUN 2:
    ran.nextInt(): 1448295644
    ran.nextInt(50): 47
    
    RUN 3:
    ran.nextInt(): 397396236
    ran.nextInt(50): 11

> 翻译自: [https://www.includehelp.com/java/random-nextint-method-with-example.aspx][https_www.includehelp.com_java_random-nextint-method-with-example.aspx]

[https_www.includehelp.com_java_random-nextint-method-with-example.aspx]: https://www.includehelp.com/java/random-nextint-method-with-example.aspx