[Ch3] Solutions to the code exercises (5342a099) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch3/Books.java

+3 −1

Changes for src/main/java/ch3/Books.java: 3 added lines, 1 removed line.
Original line number	Diff line number	Diff line
		@@ -7,9 +7,11 @@ class Books {

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

		Books[] myBooks = new Books[3];
		int x = 0;
		myBooks[0] = new Books();
		myBooks[1] = new Books();
		myBooks[2] = new Books();
		myBooks[0].title = "The Grapes of Java";
		myBooks[1].title = "The Java Gatsby";
		myBooks[2].title = "The Java Cookbook";

+2 −3

Changes for src/main/java/ch3/Hobbits.java: 2 added lines, 3 removed lines.
Original line number	Diff line number	Diff line
		@@ -5,9 +5,8 @@ class Hobbits {

		public static void main(String[] args) {
		Hobbits[] h = new Hobbits[3];
		int z = 0;

		while (z < 4) {
		int z = -1;
		while (z < 2) {
		z = z + 1;
		h[z] = new Hobbits();
		h[z].name = "bilbo";

+28 −25

Changes for src/main/java/ch3/Triangle.java: 28 added lines, 25 removed lines.
Original line number	Diff line number	Diff line
		package ch3;

		class Triangle {
		// double area;
		// int height;
		// int length;
		// public static void main(String [] args) {
		// ____________
		// _______________________
		// while ( __________ ) {
		// __________________________
		// ________.height = (x + 1) * 2;
		// ________.length = x + 4;
		// __________________________
		// System.out.print("triangle "+x+", area");
		// System.out.println(" = " + _______.area);
		// ________________
		// }
		// ______________
		// x = 27;
		// Triangle t5 = ta[2];
		// ta[2].area = 343;
		// System.out.print("y = " + y);
		// System.out.println(", t5 area = "+ t5.area);
		// }
		// void setArea() {
		// ____________ = (height * length) / 2;
		// }
		double area;
		int height;
		int length;

		public static void main(String[] args) {
		int x = 0;
		Triangle[] ta = new Triangle[4];
		while (x < 4) {
		ta[x] = new Triangle();
		ta[x].height = (x + 1) * 2;
		ta[x].length = x + 4;
		ta[x].setArea();
		System.out.print("triangle " + x + ", area");
		System.out.println(" = " + ta[x].area);
		x = x + 1;
		}
		int y = x;
		x = 27;
		Triangle t5 = ta[2];
		ta[2].area = 343;
		System.out.print("y = " + y);
		System.out.println(", t5 area = " + t5.area);
		}

		void setArea() {
		area = (height * length) / 2;
		}
		}


		@@ -33,6 +35,7 @@ class Triangle {
		// double area;
		// int height;
		// int length;
		//
		// public static void main(String[] args) {
		// ____________
		// _______________________