分类: Java
2010-01-29 15:58:10
public class RandomTest{
public static void main(String[] args){
int i=Math.random();//random()会自动产生一个0.0-1.0的双精度随机数
System.out.println(i);//输出
i=Math.random()*1000;//产生0-1000的双精度随机数
System.out.println(i);
int b=(int)(Math.random()*1000);//产生0-1000的整数随机数
System.out.println(b);
}
} |
import java.util.random
public class RandomTest{
public static void main(String[] args){
Random random=new Random();//创建random对象
int intNumber=random.nextInt();//获取一个整型数 float floatNumber=random.nextFloat();//获取一个浮点数(0-1) double doubleNumber=random.nextDouble();//获取双精度数(0-1) boolean booleanNumber=random.nextBoolean();//获取boolean数 System.out.println("intNumber:"+intNumber); System.out.println("floatNumber:"+floatNumber); System.out.println("doubleNumber:"+doubleNumber); System.out.println("booleanNumber:"+booleanNumber); }
} |
Random random=new Random(100); |
import java.util.random
public class RandomTest{
public static void main(String[] args){
Random random1=new Random(100);
Random random2=new Random(100); for(int i=0;i<5;i++){ System.out.print(random1.nextInt()+"\t"); System.out.println(random2.nextInt()+"\t"); System.out.println("---------------------------------"); } }
} |