Shulou(Shulou.com)06/02 Report--

This article mainly introduces the use of Java Random, the article is very detailed, has a certain reference value, interested friends must read it!

The Random class is located under the java.util package, and instances of this class are used to generate random numbers.

Case 1:

Import java.util.Random

Import java.util.Scanner

Public class RandomDemo {

Public static void main (String [] args) {

/ / the system generates a random number between 1 and 100

Random r = new Random ()

/ / get random number

Int number = r.nextInt (100) + 1

/ / guess the data many times

While (true) {

/ / enter the data to be guessed by the keyboard

Scanner sc = new Scanner (System.in)

System.out.println ("Please enter the data you guessed (range 1100):")

Int guessnumber = sc.nextInt ()

/ / compare two data and use if statement to realize

If (guessnumber > number) {

System.out.println ("you guess the data is too big")

} else if (guessnumber < number) {

System.out.println ("your guess is small")

} else {

System.out.println ("Congratulations, you guessed right")

Break

}

}

}

}

Running result:

Please enter the data you guessed (range 1-100):

twelve

The number you guessed is small.

Case 2:

Import java.util.Random

Public class CallName {

Public static void main (String [] args) {

System.out.println ("students in the class:")

String [] arr = {"zhangsan", "lisi", "wangwu", "sjls", "qianqi"}

For (int I = 0; I < arr.length;i++) {

System.out.print ("student number" + (item1) + ":" + arr [I] + "")

}

System.out.println ()

/ / use random numbers for roll call

Random ran = new Random ()

Int index = ran.nextInt (arr.length)

System.out.println ("student number" + (index+1) + ":" + arr [index] + "")

}

}

Running result:

The students in the class are:

Student number 1: zhangsan student number 2: lisi student number 3: wangwu student number 4: sjls student number 5: qianqi

Student number 3: wangwu

Case 3:

Import java.util.*

Public class V {

Public static void main (String [] args) {

Int a [] = new int [100]

For (int iTuno Bandi)

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