In array insertion, we can insert new element into first, end position or even in middle position of an array.

Insert an element at given user’s position of an array.

importjava.util.*;
import java.util.Scanner;
import java.io.*;
 
class main1{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
intpos,x,cnt=0,j=0;
int array[] = new int[10]; // array length = 10
        array[0]=21;
        array[1]=11;
        array[2]=-67;
        array[3]=-90;
        array[4]=4;
System.out.println(“\n Enter position of element for insert : “);
pos = sc.nextInt();
int g;
        for (x=0;x<10 ;x++ ) {
            g = array[x];
            if (g>0 || g<0) {
cnt++;
            }
        }
intloopStart = pos;
intloopEnd=cnt;
intp,q;
         p=loopEnd;
            q=loopEnd-1;
        for (j=loopStart;j<loopEnd ;j++ ) {
            array[p] = array[q];
            p–;
            q–;
        }
System.out.println(“\n Enter value for this position : “);
        array[pos] = sc.nextInt();
 
int z;
        for (z=0;z<loopEnd+1;z++ ) {
System.out.println(“\t “+ array[z]);
        }
 
    }
}
output

Insert an element in particular position of an array, which already sorted in ascending order. 

importjava.util.*;
import java.util.Scanner;
import java.io.*;
 
class main2{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
intpos=0,x,cnt=0,j=0;
int array[] = new int[10]; // array length = 10
        array[0]=11;
        array[1]=21;
        array[2]=31;
        array[3]=40;
        array[4]=60;
int g;
        for (x=0;x<10 ;x++ ) {
            g = array[x];
            if (g>0 || g<0) {
cnt++;
            }
        }
System.out.println(“\n Enter value : “);
intval = sc.nextInt();
int loop1 = cnt-1;
        for(x=0;x<loop1;x++){
            if(array[x]<val&&val<array[x+1]){
pos=x+1;
            }
        }
System.out.println(“\n index of inserted value will “+pos);
 
intloopStart = pos;
intloopEnd=cnt;
intp,q;
         p=loopEnd;
            q=loopEnd-1;
        for (j=loopStart;j<loopEnd ;j++ ) {
            array[p] = array[q];
            p–;
            q–;
        }
       array[pos]=val;
 
int z;
        for (z=0;z<loopEnd+1;z++ ) {
System.out.println(“\t “+ array[z]);
        }
 
    }
}
output

Insert an element at the end of an array(1D array)

import java.util.Scanner;
 
class main3{
    public static void main(String[] args){
int array[] = new int[10];
       array[0]=11;
       array[1]=21;
       array[2]=90;
       array[3]=-9;
       array[4]=3;
intcnt=0;
       for (int x=0;x<10 ; x++) {
           if (array[x]<0 || array[x]>0) {
cnt=cnt+1;
           }
       }
System.out.println(“\n enter element to add the end : “);
       Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
       array[cnt]=n;
       for (int y=0;y<cnt+1 ;y++ ) {
System.out.println(“\t”+array[y]);
       }
    }
}
output

Insert element at first position of an array.

import java.util.Scanner;
 
class main4{
    public static void main(String[] args){
int array[] = new int[10];
int x;
       array[0]=11;
       array[1]=21;
       array[2]=90;
       array[3]=-9;
       array[4]=3;
intcnt=0;
       for (x=0;x<10 ; x++) {
           if (array[x]<0 || array[x]>0) {
cnt=cnt+1;
           }
       }
System.out.println(“\n before insertion array was \n “);
       for (x=0;x<cnt ;x++ ) {
System.out.println(“\t”+array[x]);
       }
System.out.println(“\n enter element to add first position : “);
       Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
 
intlastIndex=cnt;
int loop=cnt+1,p=cnt-1,q=cnt,i;
System.out.println(“\n after insertion of element at first position, array becomes “);
 
       for (i=0;i<loop-1;i++ ) {
           array[q]=array[p];
           p–;
           q–;
       }
       array[0]=n;
       for (int y=0;y<cnt+1 ;y++ ) {
System.out.println(“\t”+array[y]);
       }
    }
}
output

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