How do I get ./problems.java error removed?

Question

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import java.util.Scanner;

public class replaceFirst;
    {
        public static String replaceFirst(String Str,char c)
        {
            if(Str == null)
                return null;
            else if(Str == "")
                return "";
            else
            {
                Str = Str.substring(0,0) + c + Str.substring(0 + 1);// modified string
                return Str;
            }
        }
   public static void main(String[] args) 
    {
       //Here Str.substring(0,0) will remove the first charcter 
       //And the c + Str.substring(0 + 1) will add the character c before the string (sub string starting from index 1 to last index) 
       //Output - "casant"
       System.out.print( replaceFirst("basant",'c'));
       
       //New line character
       System.out.print("\n");
       
       //Here null indicates no value (blank) and letter 't' will be added in that blank space
        System.out.print( replaceFirst(null,'t'));
        System.out.print("\n");
        
        //If we put null in double quotes then it will be considered as a string 
        //So again Str.substring(0,0) will remove the first charcter 
        //And the c + Str.substring(0 + 1) will add the character c (value 't') before the string (sub string starting from index 1 to last index) 
        // We will get "tull" as output
        System.out.print( replaceFirst("null",'t'));
        System.out.print("\n");
        
        //Here Str.substring(0,0) will remove the first charcter 
        //And the c + Str.substring(0 + 1) will add the character c (value 'm') before the string (sub string starting from index 1 to last index) 
        //Output - "mice"
        System.out.print( replaceFirst("lice",'m'));
        System.out.print("\n");
        
        //Here again Str.substring(0,0) will remove the first charcter 
        //And the c + Str.substring(0 + 1) will add the character c ('t') before the string (sub string starting from index 1 to last index) 
        //And here no characters are there after Index 0 in string "a"  
        //Output - "t"
        System.out.print( replaceFirst("a",'t'));
        
    }
    }

What I have tried:

<pre>import java.util.Scanner;

public class replaceFirst;
    {
        public static String replaceFirst(String Str,char c)
        {
            if(Str == null)
                return null;
            else if(Str == "")
                return "";
            else
            {
                Str = Str.substring(0,0) + c + Str.substring(0 + 1);// modified string
                return Str;
            }
        }
   public static void main(String[] args) 
    {
       //Here Str.substring(0,0) will remove the first charcter 
       //And the c + Str.substring(0 + 1) will add the character c before the string (sub string starting from index 1 to last index) 
       //Output - "casant"
       System.out.print( Problems.replaceFirst("basant",'c'));
       
       //New line character
       System.out.print("\n");
       
       //Here null indicates no value (blank) and letter 't' will be added in that blank space
        System.out.print( ProblemsreplaceFirst(null,'t'));
        System.out.print("\n");
        
        //If we put null in double quotes then it will be considered as a string 
        //So again Str.substring(0,0) will remove the first charcter 
        //And the c + Str.substring(0 + 1) will add the character c (value 't') before the string (sub string starting from index 1 to last index) 
        // We will get "tull" as output
        System.out.print( Problems.replaceFirst("null",'t'));
        System.out.print("\n");
        
        //Here Str.substring(0,0) will remove the first charcter 
        //And the c + Str.substring(0 + 1) will add the character c (value 'm') before the string (sub string starting from index 1 to last index) 
        //Output - "mice"
        System.out.print( Problems.replaceFirst("lice",'m'));
        System.out.print("\n");
        
        //Here again Str.substring(0,0) will remove the first charcter 
        //And the c + Str.substring(0 + 1) will add the character c ('t') before the string (sub string starting from index 1 to last index) 
        //And here no characters are there after Index 0 in string "a"  
        //Output - "t"
        System.out.print( Problems.replaceFirst("a",'t'));
        
    }
    }

Posted 31-Oct-21 11:22am

Nikita Shadurski

Updated 1-Nov-21 8:39am

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Comments

Richard MacCutchan 1-Nov-21 4:36am

In addition to OriginalGriff's comment below, your class should be called Problems.

3 solutions

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phil.o · Answer 1 · 2021-11-01T00:29:00

The class replaceFirst should be named Problems instead, as Richard told you in his comment.

Java

public class Problems

Moreover, there is a dot missing between "Problems" and "replaceFirst" in the second invocation of the method in the main function. Replace

Java

System.out.print( ProblemsreplaceFirst(null,'t'));

with

Java

System.out.print( Problems.replaceFirst(null,'t'));
                          ^

OriginalGriff · Answer 2 · 2021-10-31T20:59:00

Solution 1

Remove the semicolon:

Java

public class replaceFirst;
    {
    ...

Should be

Java

public class replaceFirst
    {
    ...

Posted 31-Oct-21 20:59pm

OriginalGriff

Marco Puccetti · Answer 3 · 2021-11-01T08:39:00

Hello, in this case:

//Here null indicates no value (blank) and letter 't' will be added in that blank space

System.out.print( replaceFirst(null,'t'));
System.out.print("\n");

The code should return null without doing anything else isn't it?
If you need to return a blank space plus the 'c' character value, you would add this lines in your function:

public static String replaceFirst(String Str,char c)
        {
            if(Str == null)
                return new String("")+c;
            else if(Str == "")
                return ""+c;
            else
            {
                Str = Str.substring(0,0) + c + Str.substring(0 + 1);// modified string
                return Str;
            }
        }

Yoy can avoid to test the char c parameter but it could contain some wrong values, if not properly initiated.

How do I get ./problems.java error removed?

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