Java - Thinking in Java 第2章練習

標籤：mystra   java   java編程思想   第2章   練習   

Thinking in Java1

//: object/HelloDate.java/** * Default initialize class. * @author C.L.Wang * @author Caroline Wendy * @version 1.0 */public class Main extends ShowProperties {    /**     * Entrv point to class & application.     * @param args array of string arguments     * @throws java.lang.Exception No exceptions thrown     */    public static void main(String[] args) {        DefaultInit di = new DefaultInit();        System.out.println("default int = " + di.i + ", default char = " + di.c);    }    /**     * Output:     * default int = 0, default char =     *///:~}

2

//: object/HelloDate.java/** * Say Hello World * @author C.L.Wang * @author Caroline Wendy * @version 1.0 */public class Main extends ShowProperties {    /**     * Entrv point to class & application.     * @param args array of string arguments     * @throws java.lang.Exception No exceptions thrown     */    public static void main(String[] args) {        System.out.println("Hello, World");    }    /**     * Output:     * Hello, World     *///:~}

3

public class ATNTest {   public static void main(String[] args) {      class ATypeName {         int i;         double d;         boolean b;         void show() {            System.out.println(i);            System.out.println(d);            System.out.println(b);         }      }      ATypeName a = new ATypeName();      a.i = 3;      a.d = 2.7;      a.b = false;      a.show();   }}

4&5

//: object/DataOnlyTest.java// TIJ4 Chapter Object Exercise 4 page 90// Turn the DataOnly code fragments into a program that compiles and runsclass DataOnly {  int i;  double d;  boolean b;  void show() {      System.out.println(i);      System.out.println(d);      System.out.println(b);  }}public class DataOnlyTest {  public static void main(String[] args) {      DataOnly data = new DataOnly();      data.i = 47;      data.d = 1.1;      data.b = false;      data.show();  }}/*** Output:* 47* 1.1* false*///:~

6

//: StorageTest.java/** * 儲存位元組數 * Created by wangchenlong on 15/7/6. */public class StorageTest {    /**     * 字串的位元組數     * @param s 字串     * @return 位元組數     */    public static int storage(String s) {        return s.length()*2;    }    public static void main(String[] args) {        String s = "Caroline";        System.out.println(s + "位元組數佔用: " + storage(s));    }    /**     * Output:     * Caroline位元組數佔用: 16     *///:~}

7

//: IncrementableTest.java/** * 靜態變數測試 * Created by wangchenlong on 15/7/6. */class StaticTest {    static int i = 47;}class Incrementable {    static void increment() {        StaticTest.i++;    }}public class IncrementableTest {    public static void main(String[] args) {        Incrementable.increment();        System.out.println("數字變為" + StaticTest.i);    }}/** * output: * 數字變為48 *///:~

8

//: OneStaticTest.java/** * static變數單一實例測試 * Created by C.L.Wang on 15/7/6. */public class OneStaticTest {    public static void main(String[] args) {        StaticTest s1 = new StaticTest();        StaticTest s2 = new StaticTest();        //noinspection AccessStaticViaInstance        System.out.println("s1.i = " + s1.i + ", s2.i = " + s2.i);        Incrementable.increment();        //noinspection AccessStaticViaInstance        System.out.println("after increment: " + "s1.i = " + s1.i + ", s2.i = " + s2.i);    }}/** * output: * s1.i = 47, s2.i = 47 * after increment: s1.i = 48, s2.i = 48 *///:~

9

//: AutoBoxTest.java/** * 基本類型和封裝器類型 * Created by C.L.Wang on 15/7/6. */public class AutoBoxTest {    public static void main(String[] args) {        boolean b = false;        char c = ‘x‘;        byte t = 8;        short s = 16;        int i = 32;        long l = 64;        float f = 0.32f;        double d = 0.64;        Boolean B = b;        System.out.println("boolean b = " + b);        System.out.println("Boolean B = " + B);        Character C = c;        System.out.println("char c = " + c);        System.out.println("Character C = " + C);        Byte T = t;        System.out.println("byte t = " + t);        System.out.println("Byte T = " + T);        Short S = s;        System.out.println("short s = " + s);        System.out.println("Short S = " + S);        Integer I = i;        System.out.println("int i = " + i);        System.out.println("Integer I = " + I);        Long L = l;        System.out.println("long l = " + l);        System.out.println("Long L = " + L);        Float F = f;        System.out.println("float f = " + f);        System.out.println("Float F = " + F);        Double D = d;        System.out.println("double d = " + d);        System.out.println("Double D = " + D);    }}/** * Output: * ... *///:~

10

//: CommentLineTest.java/** * 命令列參數 * Created by C.L.Wang on 15/7/6. */public class CommandLineTest {    public static void main(String[] args) {        if (args.length != 3) {            System.out.println("參數不足3個");            return;        }        String result = "";        for (String s : args) {            result += s + " ";        }        System.out.println("參數: " + result);    }}/** * Output: * 參數: caroline wendy girl *///:~

11

//:AllTheColorsOfTheRainbow/** * 編碼風格測試 * Created by C.L.Wang on 15/7/6. */public class RainbowTest {    public static void main(String[] args) {        AllTheColorOfTheRainbow atc = new AllTheColorOfTheRainbow();        atc.changeTheHusOfTheColor(16);        System.out.println("theHueOfTheColor = " + atc.theHueOfTheColor);        System.out.println("anIntegerRepresentingColors = " + atc.changeAnIntegerRepresentingColors(32));    }}class AllTheColorOfTheRainbow {    int anIntegerRepresentingColors;    int theHueOfTheColor;    void changeTheHusOfTheColor(int newHue) {        theHueOfTheColor = newHue;    }    int changeAnIntegerRepresentingColors(int theHueOfTheColor) {        return anIntegerRepresentingColors = theHueOfTheColor;    }}/** * Output: * theHueOfTheColor = 16 * anIntegerRepresentingColors = 32 *///:~

12&13&14&15

參考: http://blog.csdn.net/caroline_wendy/article/details/46779719

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Java - Thinking in Java 第2章練習