for(int i=__________;i>=____________;i--)

{

    System.out.print(_______+"\t");

}

String s = new String("abcdefg");

for (int i=0; i<s.length(); i+=2){

    System.out.print(s.charAt(i));

}

        String  s1=new String("abc");

        String  s2=new String("abc"); 

        boolean b1=(s1==s2);           

        System.out.print(b1);

public class Person {

 String name = "小芳";

 public Person(String name) {

  this.name ="小兰";

 }

 public void show() {

  this.name = "小翠";

 }

 public static void main(String[] args) {

  Person p = new Person("小凤");

  System.out.print(p.name);

  p.show();

  System.out.print(p.name);

 }

}

public class Dog {

//设计一个Dog类，它有名字、颜色、年龄等属性，定义构造方法用来初始化类的这些属性，定义方法输出Dog 的信息。编写应用程序使用Dog类。

private String name;

private String color;

private int age;

public Dog(String name, String color, int age) {

super();

this.name = name;

①___________ = color;

 this.age = age;

}

public void info() {

System.out.println(name+"今年"+②________+"岁了，是一条"+color+"的狗");

}

public static void main(String[] args) {

Dog dog=new Dog("大头","黑色",2);

③__________________;//输出狗的信息

}

}