JAVA编程思想课后习习题答案

1、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) "int = " + i);"char = " + c);练习2：public class HelloWorld public static void main(String args) "Hello World!");练习3：public class ATNTest public static void m

2、ain(String args) class ATypeName int i;double d;boolean b;void show() ATypeName a = new ATypeName(); = 3; = ; = false;();练习4：public class DataOnlyTest public static void main(String args) class DataOnly int i;double d;boolean b;void show() DataOnly data = new DataOnly(); = 3; = ; = false;();练习5：publ

3、ic class DOTest2 public static void main(String args) class DataOnly int i;double d;boolean b;void show() DataOnly data = new DataOnly(); = 234; = ; = true;();练习6：public class StorageTest public static void main(String args) class StoreStuff int storage(String s) return () * 2;StoreStuff x = new Sto

4、reStuff();"hi");练习7：class StaticTest static int i = 47;class Incrementable static void increment() +; public class ITest public static void main(String args) "= " + ;StaticTest st1 = new StaticTest();StaticTest st2 = new StaticTest();"= " + ;"= " + ;Incrementa

5、ble sf = new Incrementable();();"After () called: ");" = " + ;" = " + ;();"After called: ");" = " + ;" = " + ;练习8：class StaticTest static int i = 47;class Incrementable static void increment() +; public class OneStaticTest public static voi

6、d main(String args) "= " + ;StaticTest st1 = new StaticTest();StaticTest st2 = new StaticTest();"= " + ;"= " + ;();"After () called: ");" = " + ;" = " + ;();"After called: ");" = " + ;" = " + ; = 3;"After

7、= 3, ");" = " + ;" = " + ;"Create another StaticTest, st3.");StaticTest st3 = new StaticTest();" = " + ;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;

8、float f = ;double d = ;Boolean B = b;"boolean b = " + b); "Boolean B = " + B); Character C = c;"char c = " + c);"Character C = " + C);Byte T = t;"byte t = " + t);"Byte T = " + T);Short S = s;"short s = " + s);"Short S = "

9、; + S);Integer I = i;"int i = " + i);"Integer I = " + I);Long L = l;"long l = " + l);"Long L = " + L);Float F = f;"float f = " + f);"Float F = " + F);Double D = d;"double d = " + d);"Double D = " + D);练习10：public class C

10、ommandArgTest public static void main(String args) "args0 = " + args0);"args1 = " + args1);"args2 = " + args2);练习11：public class Rainbow public static void main(String args) AllTheColorsOfTheRainbow atc = new AllTheColorsOfTheRainbow();" = " + ;(7);(77);"

11、After color change, = " + ;" = " + ;class AllTheColorsOfTheRainbow int anIntegerRepresentingColors = 0;int hue = 0;void changeTheHueOfTheColor(int newHue) hue = newHue;int changeColor(int newColor) return anIntegerRepresentingColors = newColor;练习12：public class DocTest /* Entry poing

12、to class & application.* param args array of string arguments* throws exceptions No exceptions thrown*/public static void main(String args) "Hello, it's: "); Date();练习13-1：public class Documentation1 /* A field comment */public int i;/* A method comment */public void f() 2：public c

13、lass Documentation2 Date d = new Date();void showDate() "Date = " + d);3：public class Documentation3 public static void main(String args) Date d = new Date();"d = " + d);练习14：public class Documentation4 public int i = 2;private int j = 3;public static void main(String args) Date

14、d = new Date();"d = " + d);练习15：public class HelloDocTest public static void main(String args) "Hello World!");练习16：class Tree int height;Tree() "Planting a seedling");height = 0;Tree(int initialHeight) height = initialHeight;"Creating new tree that is " + hei

15、ght + " feet tall");void info() "Tree is " + height + " feet tall");void info(String s) + ": Tree is " + height + " feet tall");public class Overloading public static void main(String args) for(int i = 0; i < 5; i+) Tree t = new Tree(i);();("

16、overloading method");("Hello from greggordon form.");"Hello from long form.");练习2：class Tube float level;public class Assign public static void main(String args) Tube t1 = new Tube();Tube t2 = new Tube(); = ; = ;("1: : " + + ", : " + ;t1 = t2;("2: :

17、" + + ", : " + ; = ; ("3: : " + + ", : " + ;练习3：class Box float a;public class PassObject2 static void f(Box y) = ;public static void main(String args) Box x = new Box(); = ;print("1: = " + ;f(x);print("2: = " + ;练习4：class VelocityCalculator sta

18、tic float velocity (float d, float t) if(t = 0) return 0f;else return d/t; public class VelocityTester public static void main(String args) float d = ;float t = ;"Distance: " + d);"Time: " + t);float v = (d, t);"Velocity: " + v);练习5：class Dog String name;String says;voi

19、d setName(String n) name = n;void setSays(String s) says = s;void showName() (name);void speak() (says);public class DogTest public static void main(String args) Dog spot = new Dog();("Spot");("Ruff!");Dog scruffy = new Dog();("Scruffy");("Wurf!");();();(); ();练习6：class Dog String name;String says;void setName(String n) name = n;void setSays(String s) says = s;void showName() (name);void speak() (says);public