/* A simplified version of an example given in Absolute Java Chp08 */

class SubjectResult {
    private String name; // e.g. "Chemistry", "Geography"
    private char grade; // e.g. 'A', 'B', 'C'

    SubjectResult(String n, char g) {name=n; grade=g;}

    @Override
    public boolean equals(Object otherObject) {
        if (otherObject == null)
            return false;

        if (this.getClass() != otherObject.getClass())
            return false;

        SubjectResult otherSR = (SubjectResult) otherObject;
        if (!this.name.equals(otherSR.name))
            return false;
        if (this.grade != otherSR.grade)
            return false;

        return true;
    }
}

class Main {
    public static void main(String[] args) {

        SubjectResult s1 = new SubjectResult("Chemistry", 'A');
        SubjectResult s2 = new SubjectResult("Physics", 'A');
        SubjectResult s3 = new SubjectResult("Chemistry", 'B');
        SubjectResult s4 = new SubjectResult("Physics", 'B');
        SubjectResult s5 = new SubjectResult("Chemistry", 'A');

        System.out.println(s1.equals(null)); // false
        System.out.println(s1.equals(s2));// false
        System.out.println(s1.equals(s3));// false
        System.out.println(s1.equals(s4));// false
        System.out.println(s1.equals(s5));// true
    }
}

/*
class SubjectResult  {
    private String name; //e.g. "Chemistry", "Geography"
    private char grade; //e.g. 'A', 'B', 'C'
    
    SubjectResult(String n, char g) {name=n; grade=g;}
    
    public boolean equal(Object otherObject) {        
        SubjectResult otherSR = (SubjectResult) otherObject;
        return this.name.equals(otherSR.name) && this.grade==otherSR.grade;
    }
}

class Main {
	public static void main(String[] args)	{
		
		SubjectResult s1 = new SubjectResult("Chemistry",'A');
		SubjectResult s2 = new SubjectResult("Physics",'A');
        SubjectResult s3 = new SubjectResult("Physics",'A');

		System.out.println(s1.equals(s2)); //false?
        System.out.println(s2.equals(s3)); //true?
	}
}
 */