public class FindElementIndex {
    public static void main(String[] args) {
        int [] arr={5,7,3};
       int count=0;
        for(int i=0;i< arr.length;i++){
         if(count==arr[i]){
             System.out.println(i);
             break;
         }
         else System.out.println("-1");
         break;}}
----------------------------------------
public class ArrayEquals {
    public static void main(String[] args) {
        int[] mass1 = {2, 3, 4};
        int[] mass2 = {2, 3, 4};
        boolean equals = mass1.length == mass2.length;
        for (int i = 0; i < mass1.length && equals; i++) {
            equals &= mass1[i] == mass2[i];
        }
        System.out.println("equals = " + equals);


    }

}

=----------------------------
public class ArraySum {
    public static void main(String[] args) {
        int [] array={5,7,3};
        int sum=0;
        for (int i=0; i<array.length;i++){
            sum+=array[i];
        }
        System.out.println(sum);
    }
}

------------------------------------
import java.util.ArrayList;
import java.util.Arrays;

public class ListEquals {
    public static void main(String[] args) {
        ArrayList<Integer> num = new ArrayList<>(
                Arrays.asList(1, 2, 3, 4, 5));
        ArrayList<Integer> num2 = new ArrayList<>(
                Arrays.asList(1, 2, 3, 4, 5,6));
        System.out.println(num.equals(num2));
    }
}
--------------------------------------------import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class ListRemoveOdd {
    public static void main(String[] args) {
        ArrayList<Integer> num = new ArrayList<>(
                Arrays.asList(1, 2, 3, 4, 5));
           for (int i=num.size()-1;i>0;i--){
               if(i%2==0){
                   num.remove(i);
               }

           }
        System.out.println(num);
    }
}
----------------------------------------------------
import javax.swing.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class ListSum {
    public static void main(String[] args) {


     ArrayList<Integer>  num=new ArrayList<>(
            Arrays.asList(1,2,3,4,5));
     int sum=0;
    for(int i=0; i<num.size(); i++){
        sum+=num.get(i);
    }
        System.out.println("sum = " + sum);
    }
}
-------------------------------------------------------------
import java.util.Arrays;

public class RemoveOddElement {
    public static void main(String[] args) {
        int[] mass1 =new int[5];
        mass1[0] = 1;
        mass1[1] = 2;
        mass1[2] = 3;
        mass1[3] = 4;
        mass1[4] = 5;

        int [] mass2=new int[mass1.length/2];
        for(int i=0;i<mass2.length;i++){
            mass2[i]=mass1[(i*2)+1];

        }
        System.out.println(Arrays.toString(mass2));
    }
}

--------------------------------------------------------------
import java.util.*;

public class ShuffleNames {
    public static void main(String[] args) {
        List<String> names = new ArrayList<>();
        Scanner in = new Scanner(System.in);
        while (true) {
            System.out.println(" Input Names");
            String name = in.nextLine();
            if (name.isEmpty()) {
                break;
            } else {
                names.add(name);
            }
        }
        Collections.shuffle(names);
        System.out.println(names);
        Collections.sort(names);
        System.out.println(names);
    }
}
----------------------------------------
public class SomeOdCouples {
    public static void main(String[] args) {
        final int SUM=8;
        int [] arr={1,2,4,7,5};

        for (int i = 0; i <arr.length ; i++) {
            for (int j=i+1;j<arr.length;j++){
                if(arr[i]+arr[j]==SUM){
                    System.out.println(arr[i]+arr[j]);
                }
            }


        }

    }
}