java 编程思想课后题（第五章）

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练习1：

public class twoSum {    public static void main(String[] args){        class Test{           String a;        }        Test a = new Test();        System.out.println(a.a);    }}

练习2：

顺序不同，先静态初始块，然后初始块，最后构造方法。
练习3：

class printIn{    printIn(){        System.out.println("Hello World!");    }}public class twoSum {    public static void main(String[] args){        printIn a = new printIn();    }}

练习4：

class printIn{    printIn(){        System.out.println("Hello World!");    }    printIn(String s){        System.out.println(s + " Hello World!");    }}public class twoSum {    public static void main(String[] args){        printIn a = new printIn();        printIn b = new printIn("hehe");    }}

练习5：

class Dog{    void bark(){        System.out.println("barking");    }    void bark(String s){        System.out.println("howling");    }}public class twoSum {    public static void main(String[] args){        Dog xiaoMing = new Dog();        xiaoMing.bark();        xiaoMing.bark("aa");    }}

练习6：

class Dog{    void bark(int a,String s){        System.out.println("barking");    }    void bark(String s,int a){        System.out.println("howling");    }}public class twoSum {    public static void main(String[] args){        Dog xiaoMing = new Dog();        xiaoMing.bark(1,"11");        xiaoMing.bark("aa",1);    }}

练习7：

class Dog{}public class twoSum {    public static void main(String[] args){        Dog xiaoMing = new Dog();    }}

练习8:

class twoWay{    void first(){        System.out.println("this is the first way");    }    void second(){        first();        this.first();    }}public class twoSum {    public static void main(String[] args){        twoWay a = new twoWay();        a.second();    }}

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