Question

How to perform binary search on long Array in Java

Answer 1

package javaapplication1;

import java.util.Arrays;

public class JavaApplication1 {

    public static void main(String[] args) {

        long longArr[] = {40, 60, 30, 10, 20, 70, 50, 90, 80};
   
        Arrays.sort(longArr);

        long ln = 30;
         
        long r = Arrays.binarySearch(longArr, ln);
        System.out.println("return index : " + r);
    }
}
 
/*

run:

return index : 2

*/

 

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Answer 2

package javaapplication1;

import java.util.Arrays;

public class JavaApplication1 {

    public static void main(String[] args) {

        long longArr[] = {40, 60, 30, 10, 20, 70, 50, 90, 80};
   
        Arrays.sort(longArr);

        long ln = 100;
        long r = Arrays.binarySearch(longArr, ln);
        System.out.println("return index : " + r);
        
        r = Arrays.binarySearch(longArr, 91);
        System.out.println("return index : " + r);
        
        r = Arrays.binarySearch(longArr, -11);
        System.out.println("return index : " + r);
        
        r = Arrays.binarySearch(longArr, -42);
        System.out.println("return index : " + r);
    }
}
 
/*

run:

return index : -10
return index : -10
return index : -1
return index : -1

*/

 

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