Update Level1.md

in28minutes · web-flow · commit f28317570234 · 2016-11-23T13:46:32.000+05:30
diff --git a/Level1.md b/Level1.md
@@ -76,13 +76,15 @@ public class Cycle {
 // Debug and see the values
 // We are breaking a few good programming principles!!!
 // Exercise 1 -> Create a new method in cycle to decrease speed.
+// We are going a little slow
 ```
 \com\in28minutes\program4\MotorBike.java
 ```
 package com.in28minutes.program4;
 
-//Learning : Creating this class from scratch. From Zero 
+//Learning : Creating this class from scratch. From Zero
 //Learning : Creating more methods and more variables 
+//Learning : Print current state of an object
 public class MotorBike {
 	int currentSpeed;
 	int currentGear;
@@ -99,8 +101,9 @@ public class MotorBike {
 		currentGear = currentGear + 1;
 	}
 
-	void prevGear() {
-		currentGear = currentGear - 1;
+	@Override
+	public String toString() {
+		return "MotorBike [currentSpeed=" + currentSpeed + ", currentGear=" + currentGear + "]";
 	}
 
 	public static void main(String[] args) {
@@ -111,13 +114,16 @@ public class MotorBike {
 		honda.currentSpeed = 600;
 
 		ducati.increaseSpeed();
-
 		honda.increaseSpeed();
+		ducati.nextGear();
+		System.out.println(ducati);
 	}
+
 }
 
 // Debug and see the values
 // We are breaking a few good programming principles!!!
+// State of an object should be changed only by a method on the object
 // We do not have limits on Speed or Gears!!! We will get there soon!
 // Exercise 1 -> Create the prevGear method
 ```
@@ -132,6 +138,9 @@ public class MotorBike {
 	int currentGear;
 
 	public MotorBike(int currentSpeed) {
+		// currentSpeed is called parameter
+		// this is a special reference variable to access
+		// values from current object
 		this.currentSpeed = currentSpeed;
 	}
 
@@ -151,6 +160,11 @@ public class MotorBike {
 		currentGear = currentGear - 1;
 	}
 
+	@Override
+	public String toString() {
+		return "MotorBike [currentSpeed=" + currentSpeed + ", currentGear=" + currentGear + "]";
+	}
+
 	public static void main(String[] args) {
 		MotorBike ducati = new MotorBike(500);
 		MotorBike honda = new MotorBike(600);
@@ -159,11 +173,54 @@ public class MotorBike {
 	}
 }
 
-// add 500 to line 30 and show how
-// We are breaking a few good programming principles!!!
 // How is constructor different from a normal method?
 // Default value for a object member variable
 // This is the first program that we created with good encapsulation!
+// There are still minor things that need to fixed! We will discuss them next!
+// add 500 to line 30 and show how eclipse can do magic
 // Exercise 1 -> Create a constructor with both current speed and current gear!
 // Exercise 2 -> Enhance earlier examples with constructors and use them!
 ```
+\com\in28minutes\program6\MotorBike.java
+```
+package com.in28minutes.program6;
+
+//Introduce If Condition
+public class MotorBike {
+	int currentSpeed;
+	int currentGear;
+
+	public MotorBike(int currentSpeed) {
+		this.currentSpeed = currentSpeed;
+	}
+
+	void increaseSpeed() {
+		currentSpeed = currentSpeed + 10;
+	}
+
+	void decreaseSpeed() {
+		currentSpeed = currentSpeed - 10;
+	}
+
+	void nextGear() {
+		currentGear = currentGear + 1;
+	}
+
+	void prevGear() {
+		currentGear = currentGear - 1;
+	}
+
+	@Override
+	public String toString() {
+		return "MotorBike [currentSpeed=" + currentSpeed + ", currentGear=" + currentGear + "]";
+	}
+
+	public static void main(String[] args) {
+		MotorBike ducati = new MotorBike(500);
+		MotorBike honda = new MotorBike(600);
+		ducati.increaseSpeed();
+		honda.increaseSpeed();
+		ducati.currentSpeed = ducati.currentSpeed + 10;
+	}
+}
+```
