Practice Questions on Java Methods

Vinnu Mukhi

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May 31, 2021

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Write a Java method to print the multiplication table of a number n.

public class practice_set_methods {
    static void multiplication(int n){
        //problem 1
        for(int i=1;i<=10;i++){
            System.out.format("%d x %d = %d\n", n,i,n*i);
        }
    }
public static void main(String[] args) {
multiplication(4);Output: 4 x 1 = 4
        4 x 2 = 8
        4 x 3 = 12
        4 x 4 = 16
        4 x 5 = 20
        4 x 6 = 24
        4 x 7 = 28
        4 x 8 = 32
        4 x 9 = 36
        4 x 10 = 40

Print the * Pattern In Increasing order:

public class practice_set_methods {
static void pattern1(int n){
    for(int i=0;i<n;i++){
        for(int j=0;j<i+1;j++){
            System.out.print("*");
        }
        System.out.println();
    }
}
public static void main(String[] args) {
pattern1(4);
    }
}Output: *
        **
        ***
        ****

Write a recursive function to calculate the sum of first n natural numbers.

public class practice_set_methods {
static int sumrec(int n){
    if(n==1){
        return 1;
    }
    else {
        return n+ sumrec(n-1);
    }
}
public static void main(String[] args) {
int c=sumrec(4);
System.out.println(c);
   }
}Ouput: 10

Print the * Pattern In decrement order:

public class practice_set_methods {
static void pattern2(int n){
    for(int i=0;i<n;i++){
        for(int j=0; j<n-i;j++){
            System.out.print("*");
        }
        System.out.println();
    }
}
public static void main(String[] args) {

        pattern2(4);
    }
}Output: ****
        ***
        **
        *

Write a Function to find an average of a set of numbers passed as arguments:

public class practice_set_methods {
static int avg(int...arr){
    int result=0;
    for(int a:arr){
        result+=a;
    }
    return (result/arr.length);
}

public static void main(String[] args) {
 System.out.println(avg(1,2,3,4,5,6,7,8,9));
    }
}Output: 5