what is oop, class, polymorphism, interface vs abstract class, left join, full join?
doubly link list reversal?
reversing words in a string eg "hello world" = "world hello"
say you have to arrays a1 and a2. a1 has elements that are in a2. How would you remove those elements from a1 (no restrictions on implementation)

Question

what is oop, class, polymorphism, interface vs abstract class, left join, full join?
doubly link list reversal?
reversing words in a string eg "hello world" => "world hello"
say you have to arrays a1 and a2. a1 has elements that are in a2. How would you remove those elements from a1 (no restrictions on implementation)

ola · Accepted Answer

@author ola
 */
public class ReverseOfStringOfWords {
    
    
    public static void main(String[] args){
    
        
    /*   
   String x = " hellaz";
   
   int g = x.indexOf("");
           
           System.out.println(g);
           
           
    
    
            */
    
   String  str2 = "helloworld";
        
        ReverseOfStringOfWords test1 = new ReverseOfStringOfWords();
        
        test1.getReverseString(str2);
      
       int x=  str2.indexOf(" ");
       
      // System.out.println(x);

    }
    
    
    public void getReverseString(String input){

if(!(input.isEmpty()) && ( (input.indexOf(" ")) != -1)){
 
    String[] str1 = input.split(" ");

int y = str1.length - 1;
for(int i = y; i>=0; i--){

System.out.println(str1[i] + " ");
}
}   
else{
        
        System.out.println(" the input is invalid");
        
        }
    }
}

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