Java编程思想（第四版）习题答案第二章练习1：public class PrimitiveTest static int i;static char c;public static void main(String args) System.out.println(int = + i);System.out.println(char = + c);练习2：public class HelloWorld public static void main(String args) System.out.println(Hello World!);练习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 = 2.71828;a.b = false;a.show();练习4：public class DataOnlyTest public static void main(String args) class DataOnly int i;double d;boolean b;void show() System.out.println(i);System.out.println(d);System.out.println(b);DataOnly data = new DataOnly();data.i = 3;data.d = 2.71828;data.b = false;data.show();练习5：public class DOTest2 public static void main(String args) class DataOnly int i;double d;boolean b;void show() System.out.println(i);System.out.println(d);System.out.println(b);DataOnly data = new DataOnly();data.i = 234;data.d = 2.1234545;data.b = true;data.show();练习6：public class StorageTest public static void main(String args) class StoreStuff int storage(String s) return s.length() * 2;StoreStuff x = new StoreStuff();System.out.println(x.storage(hi);练习7：class StaticTest static int i = 47;class Incrementable static void increment() StaticTest.i+; public class ITest public static void main(String args) System.out.println(StaticTest.i= + StaticTest.i);StaticTest st1 = new StaticTest();StaticTest st2 = new StaticTest();System.out.println(st1.i= + st1.i);System.out.println(st2.i= + st2.i);Incrementable sf = new Incrementable();sf.increment();System.out.println(After sf.increment() called: );System.out.println(st1.i = + st1.i);System.out.println(st2.i = + st2.i);Incrementable.increment();System.out.println(After Incrementable.increment called: );System.out.println(st1.i = + st1.i);System.out.println(st2.i = + st2.i);练习8：class StaticTest static int i = 47;class Incrementable static void increment() StaticTest.i+; public class OneStaticTest public static void main(String args) System.out.println(StaticTest.i= + StaticTest.i);StaticTest st1 = new StaticTest();StaticTest st2 = new StaticTest();System.out.println(st1.i= + st1.i);System.out.println(st2.i= + st2.i);Incrementable.increment();System.out.println(After Incrementable.increment() called: );System.out.println(st1.i = + st1.i);System.out.println(st2.i = + st2.i);Incrementable.increment();System.out.println(After Incrementable.increment called: );System.out.println(st1.i = + st1.i);System.out.println(st2.i = + st2.i);st1.i = 3;System.out.println(After st1.i = 3, );System.out.println(st1.i = + st1.i);System.out.println(st2.i = + st2.i);System.out.println(Create another StaticTest, st3.);StaticTest st3 = new StaticTest();System.out.println(st3.i = + st3.i);练习9：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);练习10：public class CommandArgTest public static void main(String args) System.out.println(args0 = + args0);System.out.println(args1 = + args1);System.out.println(args2 = + args2);练习11：public class Rainbow public static void main(String args) AllTheColorsOfTheRainbow atc = new AllTheColorsOfTheRainbow();System.out.println(atc.anIntegerRepresentingColors = + atc.anIntegerRepresent