CSC108 Lecture #5 Example

Student.java

class Student {
    private String name; 	// full name
 
    // getFamilyName: return the family name.
    // Only handles names of the form "CLARKE  JIM"
    public String getFamilyName () {

	int pos = 0;  	// the character position we're 
			// currently looking at
	String result = ""; 	// the family name we're
				// building up
 
	while (pos < name.length()) {

	    if (name.charAt(pos) == ' ') {
		if (pos + 1 == name.length() ||
			 name.charAt(pos+1) == ' ')

            	    return result;
            }
    		
       	    result += name.charAt(pos);
    	    pos++;
	}
	return result;
    }
}

TestStudent2.java

// Test program to create a student object and print
// the student's family name.
public class TestStudent2 {
    public static void main (String[] args) {
	Student stu = new Student ("CLARKE  JIM");
	
	    System.out.println ("Family name: >>>" +
		stu.getFamilyName() + "<<<");
    }
}

Output for TestStudent2.java

Family name: >>>CLARKE<<<

TestStudent3.java - a better test class

// Test program to create various student objects with
// different names, and print the student's family name.

public class TestStudent3 {
    public static void main (String[] args) {
	String name = "CLARKE R  JIM N ";
	Student stu = new Student (name);
	System.out.println ("\nTesting: >>" + name + "<<");
	System.out.println ("Family name: >>" + 
					stu.getFamilyName() + "<<");

   	name = "CLARKE  JIM ";
   	stu = new Student (name);
   	System.out.println ("\nTesting: >>" + name + "<<");
   	System.out.println ("Family name: >>" +
				 	stu.getFamilyName() + "<<");

   	name = "CLA R  JIM ";
   	stu = new Student (name);
   	System.out.println ("\nTesting: >>" + name + "<<");
   	System.out.println ("Family name: >>" + 
					stu.getFamilyName() + "<<");

   	name = "CLA";
   	stu = new Student (name);
   	System.out.println ("\nTesting: >>" + name + "<<");
   	System.out.println ("Family name: >>" +
					stu.getFamilyName() + "<<");

   	name = "CLA ";
   	stu = new Student (name);
   	System.out.println ("\nTesting: >>" + name + "<<");
   	System.out.println ("Family name: >>" +
					stu.getFamilyName() + "<<");

   	name = " ";
   	stu = new Student (name);
   	System.out.println ("\nTesting: >>" + name + "<<");
   	System.out.println ("Family name: >>" +
					stu.getFamilyName() + "<<");
    }
}

Output for TestStudent3.java

Testing: >>CLARKE R  JIM N <<
Family name: >>CLARKE R<<

Testing: >>CLARKE  JIM <<
Family name: >>CLARKE<<

Testing: >>CLA R  JIM <<
Family name: >>CLA R<<

Testing: >>CLA<<
Family name: >>CLA<<

Testing: >>CLA <<
Family name: >>CLA<<

Testing: >> <<
Family name: >><<