[Ch10] Initial code from the book (04bdd5ba) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch10/NoStatic.java

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Changes for src/main/java/ch10/NoStatic.java: 8 added lines, 0 removed lines.
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		package ch10;

		class NoStatic {
		public static void main(String[] args) {
		System.out.println("sqrt " + Math.sqrt(2.0));
		System.out.println("tan " + Math.tan(60));
		}
		}
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Changes for src/main/java/ch10/Snippets.java: 75 added lines, 0 removed lines.
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		package ch10;

		import java.util.ArrayList;

		public class Snippets {
		void rounding() {
		int x = Math.round(-24.8f); // returns -25
		int y = Math.round(24.45f); // returns 24
		long z = Math.round(24.45); // returns 24L
		}

		void wrapInt() {
		int x = 32;
		ArrayList<Integer> list = new ArrayList<Integer>();
		list.add(x);
		int num = list.get(0);
		}

		void wrappers() {
		boolean b = true;
		Boolean bool = b;
		char c = 'a';
		Character chr = c;
		byte bt = 0;
		Byte bte = bt;
		short s = 1;
		Short sht = s;
		int i = 2;
		Integer intr = i;
		long l = 3;
		Long lng = l;
		float f = 4;
		Float flt = f;
		double d = 5;
		Double dbl = d;
		}

		static void parse() {
		String s = "2";
		int x = Integer.parseInt(s);
		double d = Double.parseDouble("420.24");

		boolean b = Boolean.parseBoolean("True");
		}

		static void badParse() {
		String t = "two";
		int y = Integer.parseInt(t);

		System.out.println(y);
		}

		void doubleToString1() {
		double d = 42.5;
		String doubleString = "" + d;
		}

		void doubleToString2() {
		double d = 42.5;
		String doubleString = Double.toString(d);
		}

		void doubleToString3() {
		double d = 42.5;
		String doubleString = String.valueOf(d);
		}

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

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

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Changes for src/main/java/ch10/TestBox.java: 17 added lines, 0 removed lines.
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		package ch10;

		public class TestBox {
		private Integer i;
		private int j;

		public static void main(String[] args) {
		TestBox t = new TestBox();
		t.go();
		}

		public void go() {
		j = i;
		System.out.println(j);
		System.out.println(i);
		}
		}
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Changes for src/main/java/ch10/TestFormats.java: 9 added lines, 0 removed lines.
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		package ch10;

		public class TestFormats {
		public static void main(String[] args) {
		long myBillion = 1_000_000_000;
		String s = String.format("%,d", myBillion);
		System.out.println(s);
		}
		}
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Changes for src/main/java/ch10/WithStatic.java: 20 added lines, 0 removed lines.
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		package ch10;

		import java.util.function.Predicate;
		import java.util.stream.Stream;

		import static java.lang.Math.sqrt;
		import static java.lang.Math.tan;
		import static java.lang.System.out;

		class WithStatic {
		public static void main(String[] args) {
		out.println("sqrt " + sqrt(2.0));
		out.println("tan " + tan(60));
		}

		void otherStaticImports() {
		Stream.of("string")
		.filter(Predicate.not(String::isEmpty));
		}
		}
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