java中的treemap

/**
*　通过这个程序，测试树映像的使用，表目集合的遍历
*/
importjava.util.TreeMap;
importjava.util.Map;
importjava.util.Iterator;
importjava.util.Set;

publicclassTreeMapTest
{
publicstaticvoidmain(String[]args)
{
TreeMapset=newTreeMap();
TreeMapTesttest=newTreeMapTest();
//生成三个学生实例
Studenttom=newStudent("Tom","20020410");
Studentjack=newStudent("Jack","20020411");
Studentsmith=newStudent("Smith","20020412");

set.put("one",tom);
set.put("two",jack);
set.put("three",smith);

System.out.println("现在映像中元素的个数是："+set.size()+"/n");

test.getValue(set);

System.out.println("/n现在设置重复关键字，覆盖原来的对象。/n");
Studentrose=newStudent("Rose","20020413");
System.out.println("覆盖已经存在的关键字时返回值："+set.put("two",rose)+"/n");

test.getValue(set);
}

publicvoidgetValue(TreeMapset)
{
System.out.println("遍历映像中的关键字/值对分别是：");
Setentries=set.entrySet();//得到关键字/值对的集合
Iteratoriter=entries.iterator();
while(iter.hasNext())
{
Map.Entryentry=(Map.Entry)iter.next();
Stringkey=(String)entry.getKey();
Studentvalue=(Student)entry.getValue();
System.out.print(key);
System.out.println("/t/t"+value);
}
}
}

/**
*我们设计的学生基本类
*/
classStudent
{
privateStringstrName="";//学生姓名
privateStringstrNumber="";//学号
privateStringstrSex="";//性别
privateStringstrBirthday="";//出生年月
privateStringstrSpeciality="";//专业
privateStringstrAddress="";//地址

publicStudent(Stringname,Stringnumber)
{
strName=name;
strNumber=number;
}

publicStringgetStudentName()
{
returnstrName;
}

publicStringgetStudentNumber()
{
returnstrNumber;
}

publicvoidsetStudentSex(Stringsex)
{
strSex=sex;
}

publicStringgetStudentSex()
{
returnstrSex;
}

publicStringgetStudentBirthday()
{
returnstrBirthday;
}

publicvoidsetStudentBirthday(Stringbirthday)
{
strBirthday=birthday;
}

publicStringgetStudentSpeciality()
{
returnstrSpeciality;
}

publicvoidsetStudentSpeciality(Stringspeciality)
{
strSpeciality=speciality;
}

publicStringgetStudentAddress()
{
returnstrAddress;
}

publicvoidsetStudentAddress(Stringaddress)
{
strAddress=address;
}

publicStringtoString()
{
Stringinformation="学生姓名="+strName+",学号="+strNumber;
if(!strSex.equals(""))
information+=",性别="+strSex;
if(!strBirthday.equals(""))
information+=",出生年月="+strBirthday;
if(!strSpeciality.equals(""))
information+=",专业="+strSpeciality;
if(!strAddress.equals(""))
information+=",籍贯="+strAddress;
returninformation;
}
}

/**
*　通过这个程序，测试树映像的使用，表目集合的遍历
*/
importjava.util.TreeMap;
importjava.util.Map;
importjava.util.Iterator;
importjava.util.Set;

publicclassTreeMapTest2
{
publicstaticvoidmain(String[]args)
{
TreeMapset=newTreeMap(newReverseSort());
TreeMapTest2test=newTreeMapTest2();
//生成三个学生实例
Studenttom=newStudent("Tom","20020410");
Studentjack=newStudent("Jack","20020411");
Studentsmith=newStudent("Smith","20020412");

set.put("one",tom);
set.put("two",jack);
set.put("three",smith);

System.out.println("现在映像中元素的个数是："+set.size()+"/n");

test.getValue(set);

System.out.println("/n现在设置重复关键字，覆盖原来的对象。/n");
Studentrose=newStudent("Rose","20020413");
System.out.println("覆盖已经存在的关键字时返回值："+set.put("two",rose)+"/n");

test.getValue(set);
}

publicvoidgetValue(TreeMapset)
{
System.out.println("遍历映像中的关键字/值对分别是：");
Setentries=set.entrySet();//得到关键字/值对的集合
Iteratoriter=entries.iterator();
while(iter.hasNext())
{
Map.Entryentry=(Map.Entry)iter.next();
Stringkey=(String)entry.getKey();
Studentvalue=(Student)entry.getValue();
System.out.print(key);
System.out.println("/t/t"+value);
}
}
}

/**
*我们设计的学生基本类
*/
classStudent
{
privateStringstrName="";//学生姓名
privateStringstrNumber="";//学号
privateStringstrSex="";//性别
privateStringstrBirthday="";//出生年月
privateStringstrSpeciality="";//专业
privateStringstrAddress="";//地址

publicStudent(Stringname,Stringnumber)
{
strName=name;
strNumber=number;
}

publicStringgetStudentName()
{
returnstrName;
}

publicStringgetStudentNumber()
{
returnstrNumber;
}

publicvoidsetStudentSex(Stringsex)
{
strSex=sex;
}

publicStringgetStudentSex()
{
returnstrSex;
}

publicStringgetStudentBirthday()
{
returnstrBirthday;
}

publicvoidsetStudentBirthday(Stringbirthday)
{
strBirthday=birthday;
}

publicStringgetStudentSpeciality()
{
returnstrSpeciality;
}

publicvoidsetStudentSpeciality(Stringspeciality)
{
strSpeciality=speciality;
}

publicStringgetStudentAddress()
{
returnstrAddress;
}

publicvoidsetStudentAddress(Stringaddress)
{
strAddress=address;
}

publicStringtoString()
{
Stringinformation="学生姓名="+strName+",学号="+strNumber;
if(!strSex.equals(""))
information+=",性别="+strSex;
if(!strBirthday.equals(""))
information+=",出生年月="+strBirthday;
if(!strSpeciality.equals(""))
information+=",专业="+strSpeciality;
if(!strAddress.equals(""))
information+=",籍贯="+strAddress;
returninformation;
}
}