how to reverse order of arraylist
ArrayList<Integer> arrlist = new ArrayList<Integer>();
//This is how to reverse arrlist's oringinal order.
Collections.reverse(arrlist);
//This is how to sort in a reverse order
Collections.sort(arrlist, Collections.reverseOrder());Arraylist reverse in java
public static void main(String[] args) {
ArrayList<Integer>list = new ArrayList<>();
for(int i = 1; i < 6; i++){ // bu element index degil.
list.add(i);
}
System.out.println(list); // [1, 2, 3, 4, 5]
for (int i = list.size()-1; i >= 0; i--) {
int each = list.get(i); // unboxing
System.out.print(each + " "); // 5 4 3 2 1
}Arraylist reverse in ArrayList in java
I want to store them in another ArrayList
ArrayList<Integer>list1 = new ArrayList<>();
for(int a = 1; a < 8; a++){
list1.add(a);
}
System.out.println(list1); // [1, 2, 3, 4, 5, 6, 7]
ArrayList<Integer>reverse = new ArrayList<>(); //reversleri bunun icine ekledik
for (int a = list1.size()-1; a >= 0; a--) {
// int each = list1.get(a); // unboxing altaki ile ayni
reverse.add(list1.get(a));
}
System.out.println(reverse); // [7, 6, 5, 4, 3, 2, 1]
}Copyright © 2021 Codeinu
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