Array

1.Find the maximum number in the array

class Maximum{
    /*
    findMax method that accepts an array of integers  and  
    returns the largest integer in the array or return -1 
    if there is no numbers in an array.
    */
    public static int findMax(int a[]){
        if(a.length<1)
            return -1;
        int max=a[0];
        for(int i=1;i<a.length;i++){
            if(a[i]>max){
                max=a[i];
            }
        }
        return max;
    }
    public static void main(String args[]){
        int a[] = {45,76,12,34,67,89,11};
        System.out.println("Maximum number is "+findMax(a));
    }
}
/*
Output
Maximum number is 89
*/

2.Find the minimum number in the array

class Minimum{
    /*
    findMin method that accepts an array of integers  and  
    returns the least integer in the array or return -1 
    if there is no numbers in an array.
    */
    public static int findMin(int a[]){
        if(a.length<1)
            return -1;
        int min=a[0];
        for(int i=1;i<a.length;i++){
            if(min>a[i]){
                min=a[i];
            }
        }
        return min;
    }
    public static void main(String args[]){
    int a[] = {45,76,12,34,67,89,11};
    System.out.println("Minimum number is "+findMin(a));
    }
}
/*
Output
Minimum number is 11
*/

3.Merge two sorted arrays

import java.util.*;
public class Merge {
    public static int[] merge(int[] arr1, int[] arr2) {
        int[] arr = new int[arr1.length + arr2.length];
        int i = 0;
        int j = 0;
        int k = 0;
        int m = arr1.length;
        int n = arr2.length;
        while(i < m && j < n){
            if(arr1[i] < arr2[j]) {
                arr[k++] = arr1[i++];               
            } else {
                arr[k++] = arr2[j++];
            }
        }
        while(i < m){
            arr[k++] = arr1[i++];               
            
        }
        while(j < n){
            arr[k++] = arr2[j++];
            
        }
        return arr;
    }
    
    public static void main(String[] args) {
        int[] arr1 = {1, 4, 5, 8, 17};
        int[] arr2 = {2, 4, 8, 11, 13, 21, 23, 25};
        int[] arr = merge(arr1,arr2);
        for(int i=0;i<arr.length;i++)
            System.out.print(arr[i]+"\t");
    }
}
/*
output
1       2       4       4       5       8       8       11      13      17
21      23      25

*/