program

package pratice; public class arr192837 { public static void main(String[] args) { int[] arr = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; int[] result = new int[arr.length]; int left = 0; int rigth = arr.length - 1; for (int i = 0; i < arr.length; i++) { if (i % 2 == 0) result[i] = arr[left++]; else result[i] = arr[rigth--]; } for (int i = 0; i < arr.length; i++) { System.out.print(result[i] + " "); } } } 

package pratice; public class combine_2arr { public static void main(String[] args) { int[] arr1 = { 1, 2, 3, 4, 5, 6 }; int[] arr2 = { 6, 7, 4, 9, 10 }; for (int j = 0; j < arr1.length; j++) { int key = arr1[j]; for (int i = 0 ; i < arr2.length ; i++) { if (key == arr2[i]) { System.out.println("duplicate element in arr1 and arr2 = "+arr2[i]+" "); } } } } } 

package afterfeb13; public class bubblesort { public static void main(String[] args) { int[] score = { 1,-1,1,-1,1,-1,1,-1 }; for (int j = 1; j < score.length; j++)// running 7 time { for (int i = 0; i < score.length - j; i++) // j or 1 score.length-j change to index because index star from // [0] // why j order index--decrese when number order ex{80,70,60,50,80,90,90} then // index decreaseex{80,70,60,50,80}, { if (score[i] > score[i + 1])// 0>1,1>2,2>3,3>4 { int temp = score[i]; score[i] = score[i + 1]; score[i + 1] = temp; } } } for (int i = 0; i < score.length; i++) { System.out.print(score[i] + " "); } } }