在Java中,可以使用java.util.Random
類來生成隨機(jī)數(shù)。以下是一些示例代碼:
import java.util.Random;
public class RandomNumberGenerator {
public static void main(String[] args) {
int n = 10; // 范圍上限
Random rand = new Random();
int randomNumber = rand.nextInt(n); // 生成隨機(jī)整數(shù)
System.out.println(randomNumber);
}
}
import java.util.Random;
public class RandomNumberGenerator {
public static void main(String[] args) {
int a = 5; // 范圍下限
int b = 10; // 范圍上限
Random rand = new Random();
int randomNumber = rand.nextInt(b - a + 1) + a; // 生成隨機(jī)整數(shù)
System.out.println(randomNumber);
}
}
import java.util.Random;
public class RandomNumberGenerator {
public static void main(String[] args) {
Random rand = new Random();
double randomNumber = rand.nextDouble(); // 生成隨機(jī)浮點數(shù)
System.out.println(randomNumber);
}
}
import java.util.Random;
public class RandomNumberGenerator {
public static void main(String[] args) {
double a = 0.5; // 范圍下限
double b = 1.5; // 范圍上限
Random rand = new Random();
double randomNumber = a + (b - a) * rand.nextDouble(); // 生成隨機(jī)浮點數(shù)
System.out.println(randomNumber);
}
}
請注意,為了生成更加隨機(jī)的數(shù),可以在實例化java.util.Random
對象時,傳入一個種子值(即Random
的構(gòu)造函數(shù)參數(shù)),例如Random rand = new Random(System.currentTimeMillis())
。