/*File SampProg26.java from module 50
Copyright 1997, R.G.Baldwin
Without viewing the solution that follows, write a Java
application that illustrates conversion from string to 
numeric, similar to the atoi() function in C.

The output from the program should be:
The value of the int variable num is 3625
===========================================================
*/

class SampProg26{
  public static void main(String[] args){
    int num = new Integer("3625").intValue();
    System.out.println(
      "The value of the int variable num is " + num);
  }//end main()
}//end class SampProg26

/*File SampProg25.java from module 50
Copyright 1997, R.G.Baldwin
Write a Java application that illustrates different ways to
create String objects and StringBuffer objects.

The output from this program should be (line breaks 
manually inserted to make it fit the format):

Create a String using new and display it
String named str2

Create a String without using new and display it
String named str1

Create, initialize, and display a StringBuffer using new
StringBuffer named str3

Try to create/initialize StringBuffer without using new 

Create an empty StringBuffer of default length
Now put some data in it and display it
StringBuffer named str5

Create an empty StringBuffer and specify length when 
created
Now put some data in it and display it
StringBuffer named str6

Try to create and append to StringBuffer without using new
**********************************************************/

class SampProg25{
  void d(String displayString){//method to display strings
    System.out.println(displayString);
  }//end method d()

  public static void main(String[] args){
    //instantiate an object to display methods
    SampProg25 o = new SampProg25();
    
    o.d("Create a String using new and display it");
    String str1 = new String("String named str2");
    o.d(str1 + "\n");
    
    o.d(
    "Create a String without using new and display it");
    String str2 = "String named str1";
    o.d(str2 + "\n");
  
    o.d("Create, initialize, and display a StringBuffer " 
      + "using new");
    StringBuffer str3 = new StringBuffer(
      "StringBuffer named str3");
    o.d(str3.toString()+"\n");

    o.d("Try to create/initialize StringBuffer without " 
      + "using new \n");    
    //StringBuffer str4 = //not allowed by compiler
    //  "StringBuffer named str4";
    
    o.d(
    "Create an empty StringBuffer of default length");  
    //accept default initial length
    StringBuffer str5 = new StringBuffer();
    o.d("Now put some data in it and display it");
    //modify length as needed
    str5.append("StringBuffer named str5");
    o.d(str5.toString() + "\n");
    
    o.d("Create an empty StringBuffer and specify length "
      + "when created");
    StringBuffer str6 = new StringBuffer(
      "StringBuffer named str6".length());
    o.d("Now put some data in it and display it");    
    str6.append("StringBuffer named str6");
    o.d(str6.toString() + "\n");
    
    o.d(
    "Try to create and append to StringBuffer without "
      + "using new");
    //StringBuffer str7;
    //str7.append("StringBuffer named str7");
  }//end main()  
}//end class SampProg25

/*File SampProg24.java from module 50
Copyright 1997, R.G.Baldwin
Without viewing the solution that follows, Write a Java
application that illustrates the fact that while a String 
object cannot be modified, the reference variable can be 
modified to point to a new String object which can have the
appearance of modifying the original String object.

The output from this program should be

Display original string values
THIS STRING IS NAMED str1
This string is named str2
Replace str1 with another string
Display new string named str1
THIS STRING IS NAMED str1 This string is named str2
Terminating program
**********************************************************/

class SampProg24{
  String str1 = "THIS STRING IS NAMED str1";
  String str2 = "This string is named str2";
  
  public static void main(String[] args){
    SampProg24 thisObj = new SampProg24();
    System.out.println("Display original string values");
    System.out.println(thisObj.str1);
    System.out.println(thisObj.str2);
    System.out.println(
      "Replace str1 with another string");
    thisObj.str1 = thisObj.str1 + " " + thisObj.str2;
    System.out.println("Display new string named str1");
    System.out.println(thisObj.str1);
    System.out.println("Terminating program");
  }//end main()
}//end class SampProg24