Help troubleshooting java CharList code. Need to get this class working and outp

Question

Help troubleshooting java CharList code.

Need to get this class working and outputting the correctly. Class takes in a string, then puts the individual chars of that string into an array. I have commented the methods that need work, or I am unsure of.

I'll post my class code and drive code below! Thanks!

Here is what is suppose output:

a is :katnis and has 6 chars

b is :Batman and has 6 chars

c is :Batman and has 6 chars

B and A are equal : false

B and C are equal : true

//////////// Java code

public class CharList {

private char[] storeChars = new char[ 100 ];
private int numChars = 0;
private String input;
  
public CharList() {
// default no-arg constructor
}
  
public CharList( String startStr ) { // sets up internals

this.input = startStr;
for ( int i = 0; i < startStr.length(); i++ ) {
char a = startStr.charAt( i );
this.add( a );
}
}
  
public CharList( CharList other ) { // Copy constructor
if ( other == null ) { // checks null input
throw new IllegalArgumentException( "Null input" );
} else {
//this.input = other.(); NOT SURE HOW THIS GOES
this.numChars = other.size();
// this.storeChars = other.
}
}

public void add( char next ) {
this.storeChars[ numChars ] = next;
this.numChars++;
}

public char get( int index ) {

// returns the char at that particular index
}
  
public int size() {   
return numChars;
}
  
public boolean equals() {
// checks to see if equal
}

@Override
public String toString() {

// concatenates the chars in the array to form a String  
}
}

////// Driver code

public class CharListDriver {

public static void main( String[] args ) {
charListDriver();
}
private static void charListDriver() {
CharList a = new CharList();
CharList b = new CharList( "Batman" );
CharList c = new CharList( b );
a.add( 'k' );
a.add( 'a' );
a.add( 't' );
a.add( 'n' );
a.add( 'i' );
a.add( 's' );
System.out.println( "a is :" + a.toString() + " and has " + a.size() + " chars" );
System.out.println( "b is :" + b.toString() + " and has " + b.size() + " chars" );
System.out.println( "c is :" + c.toString() + " and has " + c.size() + " chars" );
//System.out.println( "B and A are equal : " + b.equals( a ) );
//System.out.println( "B and C are equal : " + b.equals( c ) );
}

}

Explanation / Answer

//////////// Java code
class CharList {
private char[] storeChars = new char[ 100 ];
private int numChars = 0;
private String input;
  
public CharList() {
// default no-arg constructor
}
  
public CharList( String startStr ) { // sets up internals
this.input = startStr;
for ( int i = 0; i < startStr.length(); i++ ) {
char a = startStr.charAt( i );
this.add( a );   
}
}
  
public CharList( CharList other ) { // Copy constructor
if ( other == null ) { // checks null input
throw new IllegalArgumentException( "Null input" );
} else {
//this.input = other.(); NOT SURE HOW THIS GOES
this.numChars = other.size();
// this.storeChars = other.   
}
}
public void add( char next ) {
this.storeChars[ numChars ] = next;
this.numChars++;
}
public char get( int index ) {
return storeChars[index];
}
  
public int size() {   
return numChars;
}
  
public boolean equals(CharList b) {
       return this.input == b.input;
// checks to see if equal
}
@Override
public String toString() {
// concatenates the chars in the array to form a String
       input = "";
       for(int i = 0; i < numChars; i++){
           input += storeChars[i];
       }
       return input;
}
}

////// Driver code
public class CharListDriver {
public static void main( String[] args ) {
charListDriver();   
}
private static void charListDriver() {
CharList a = new CharList();
CharList b = new CharList( "Batman" );
CharList c = new CharList( b );
a.add( 'k' );
a.add( 'a' );
a.add( 't' );
a.add( 'n' );
a.add( 'i' );
a.add( 's' );
System.out.println( "a is :" + a.toString() + " and has " + a.size() + " chars" );
System.out.println( "b is :" + b.toString() + " and has " + b.size() + " chars" );
System.out.println( "c is :" + c.toString() + " and has " + c.size() + " chars" );
System.out.println( "B and A are equal : " + b.equals( a ) );
System.out.println( "B and C are equal : " + b.equals( c ) );   
}
}

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