4. Reading the following codes, and answer the questions. String s new String(\"

Question

4. Reading the following codes, and answer the questions. String s new String("abc"); String s1 "abc"; System out println(s s1) System.out.println(s s2); System out println(s1 s2); Q1: How many objects are created after the first three statements executed? What's the output of the program containing the above statements? String hello Thello": String heel "hel' String lo System out println(hello "hel" 11o); System.out.println(hello "hel' lo), Q2: What's the output of the program with above statements? Explain why. 5. (Binary to decimal Write a method that parses a binary number as a string into a decimal integer. The method header is as follows: public static int binaryToDecimal(String binaryString) For example, binary string 10001 is 17. So, binaryToDecimal("10001") returns 17. Note that Integer.parselnt(" 10001", 2) parses a binary string to a decimal value. Do not use this method in this exercise. program that prompts the user to enter a binary string and displays the corresponding decimal integer value.

Explanation / Answer

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

      
       String s = new String("abc");
       String s1="abc";
       String s2 = new String("abc");
       System.out.println(s==s1);
       System.out.println(s==s2);
       System.out.println(s1==s2);
      
      
      
   }  
  
      
}

sample output

false
false
false

Three objects are created

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

String hello="hello";
String hel ="hel";
String lo ="lo";
System.out.println(hello=="hel" +"lo");

System.out.println(hello=="hel" +lo);  
   }  
  
      
}

sample output

true
false

public class BinaryToDecimal
{
   public static void main(String[] args)
   {
       String binaryString = "10001";
       System.out.println(binaryToDecimal(binaryString));
      

//   System.out.println(Integer.parseInt(binaryString, 2);
   }
   //10001
   public static int binaryToDecimal(String binaryString)
   {
       int decimal = 0;
       for(int i=0; i<binaryString.length() -1 ; i++)
       {
           if(binaryString.charAt(i) != 0)
           {
               decimal += Math.pow(2, i);
           }
          
       }
       return decimal;
   }
}

sample output

15

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