package seedu.jobs.model.task;

/**
 * Represents a Task's description in JOBS.
 */

public class Description {
	
	public static final String DEFAULT_VALUE = "";
	public final String value;
	
	public Description(String description){
		this.value = (description==null) ? DEFAULT_VALUE : description;
	}
	
	@Override
	public String toString(){
		return this.value;
	}
	
	@Override
    public boolean equals(Object other) {
        return other == this // short circuit if same object
                || (other instanceof Description // instanceof handles nulls
                && this.value.equals(((Description) other).value)); // state check
    }

    @Override
    public int hashCode() {
        return value.hashCode();
    }

}

package seedu.jobs.model.task;

import seedu.jobs.commons.exceptions.IllegalValueException;

/**
 * Represents a Task's description in JOBS.
 */

public class Description {
	
	public static final String DEFAULT_DESCRIPTION = "";
	public static final String  MESSAGE_DESCRIPTION_CONSTRAINT = "Description cannot be more than 150 characters";
	public static final int DESCRIPTION_LENGTH_CONSTRAINT = 150;
	public final String value;
	
	public Description(String description) throws IllegalValueException{
		if(description==null){
			this.value = DEFAULT_DESCRIPTION;
		}
		else{
			if(!isValidDescription(description)){
				throw new IllegalValueException(MESSAGE_DESCRIPTION_CONSTRAINT);
			}
			this.value = description;
		}
	}
	
	public boolean isValidDescription(String description){
		return description.length() <= DESCRIPTION_LENGTH_CONSTRAINT;
	}
	
	@Override
	public String toString(){
		return this.value;
	}
	
	@Override
    public boolean equals(Object other) {
        return other == this // short circuit if same object
                || (other instanceof Description // instanceof handles nulls
                && this.value.equals(((Description) other).value)); // state check
    }
	
    @Override
    public int hashCode() {
        return value.hashCode();
    }

}

Add constraint for description's length