Question

java please

1. Write a Java program to generate random numbers in the following range

a. 1 <=n <= 3

b. 1 <= n <= 200

c. 0 <= n <= 9

d. 1000 <= n <= 2112

e. -1 <= n <= 5

2. Write statements that assign random integers to the variable n in the following ranges:

a) 1 ≤ n ≤ 2

b) 1 ≤ n ≤ 100

c) 0 ≤ n ≤ 9

d) 1000 ≤ n ≤ 1112

e) –1 ≤ n ≤ 1

f) –3 ≤ n ≤ 11

Put these statements in Java program and run it.

3. Write a complete Java application to prompt the user for the double radius of a sphere, and

call method sphereVolume to calculate and display the volume of the sphere. Use the following statement

to calculate the volume:

double volume = ( 4.0 / 3.0 ) * Math.PI * Math.pow( radius, 3 )

Answer 1

import java.util.*;

class Hello {

    public static void main(String[] args) {

        Random r = new Random();

        // r.ints(x,y+1).findFirst().getAsInt() will return a random integer in the

        // range [x,y]

        int a = r.ints(1, (3 + 1)).findFirst().getAsInt();

        // a will get a random value in the range [1,3]

        int b = r.ints(1, (200 + 1)).findFirst().getAsInt();

        // b will get a random value in the range [1,3]

        int c = r.ints(0, (9 + 1)).findFirst().getAsInt();

        // c will get a random value in the range [1,3]

        int d = r.ints(1000, (2112 + 1)).findFirst().getAsInt();

        // d will get a random value in the range [1,3]

        int e = r.ints(-1, (5 + 1)).findFirst().getAsInt();

        // e will get a random value in the range [1,3]

        System.out.println(a);

        System.out.println(b);

        System.out.println(c);

        System.out.println(d);

        System.out.println(e);

    }

}

output: