Week 8 - Loop Review - Student Example

Student.java

class Student {
	private String name; 	// full name (family and given names)

	/*
	The name string consists of these parts, in order:
	1) the family name, possibly including some (single) blanks
	2) a double blank "  " if necessary to separate the
	family name from the given names
	3) zero or more given names
	4) maybe some trailing blanks
	Only part (1) is required.
	*/

	// 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;
	}
}

TestStudent.java

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

Output for TestStudent.java

Family name: >>>CLARKE<<<

TestStudent2.java - a better test class

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

public class TestStudent2 {
    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 TestStudent2.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: >><<