[Ch10] All chapter code added (2ac841a3) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch10/Foof.java

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+46 −0

Changes for src/main/java/ch10/MathMethods.java: 46 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		package ch10;

		public class MathMethods {

		static void random() {
		double r1 = Math.random();
		System.out.println("r1 = " + r1);
		int r2 = (int) (Math.random() * 5);
		System.out.println("r2 = " + r2);
		}

		static void abs() {
		int x = Math.abs(-240); // returns 240
		double d = Math.abs(240.45); // returns 240.45
		}

		static void round() {
		int x = Math.round(-24.8f); // returns -25
		System.out.println("x = " + x);
		int y = Math.round(24.45f); // returns 24
		System.out.println("y = " + y);

		long z = Math.round(24.45); // returns 24L
		System.out.println("z = " + z);
		}

		static void min() {
		int x = Math.min(24,240); // returns 24
		System.out.println("x = " + x);

		double y = Math.min(90876.5, 90876.49); // returns 90876.49
		System.out.println("y = " + y);
		}

		static void max() {
		int x = Math.max(24,240); // returns 240
		System.out.println("x = " + x);
		double y = Math.max(90876.5, 90876.49); // returns 90876.5
		System.out.println("y = " + y);
		}


		public static void main(String[] args) {
		max();
		}
		}

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Changes for src/main/java/ch10/MyMostPerfectClass.java: 5 added lines, 0 removed lines.
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		package ch10;

		final class MyMostPerfectClass {
		// cannot be extended
		}
		No newline at end of file

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Changes for src/main/java/ch10/Poof.java: 8 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		package ch10;

		class Poof {
		final void calcWhuffie() {
		// important things
		// that must never be overridden
		}
		}
		No newline at end of file

+40 −1

Changes for src/main/java/ch10/Snippets.java: 40 added lines, 1 removed line.
Original line number	Diff line number	Diff line
		@@ -3,6 +3,17 @@ package ch10;
		import java.util.ArrayList;

		public class Snippets {
		void mathMethods() {
		long x = Math.round(42.2);
		int y = Math.min(56, 12);
		int z = Math.abs(-343);
		}

		public static int min(int a, int b) {
		//returns the smallest of a and b
		return Math.min(a, b);
		}

		void rounding() {
		int x = Math.round(-24.8f); // returns -25
		int y = Math.round(24.45f); // returns 24
		@@ -35,6 +46,14 @@ public class Snippets {
		Double dbl = d;
		}

		public void autoboxing() {
		int x = 32;
		ArrayList<Integer> list = new ArrayList<Integer>();
		list.add(x);

		int num = list.get(0);
		}

		static void parse() {
		String s = "2";
		int x = Integer.parseInt(s);
		@@ -69,7 +88,27 @@ public class Snippets {
		String.format("I have %.2f, bugs to fix.", 476578.09876);
		}

		static void formatWithCommas() {
		String.format("I have %,.2f, bugs to fix.", 476578.09876);
		}

		static void formatDecimal() {
		System.out.println(String.format("%d", 42));
		}

		static void formatFloat() {
		System.out.println(String.format("%.3f", 42.000000));
		}

		static void formatHex() {
		System.out.println(String.format("%x", 42));
		}

		static void formatChar() {
		System.out.println(String.format("%c", 42));
		}

		public static void main(String[] args) {
		format();
		formatChar();
		}
		}