java接口与实现接口的类实验报告

// TODO 自动生成的方法存根 return pl . https://www.doczj.com/doc/b05920733.html,pareTo( p2. name);

}

}

package person; import

public class CompareBirthday

impleme nts ComparatorvPers on>{

@Override

public int compare(Pers on

p1 , Pers on

p2) {

// TODO 自动生成的方法存根 return p1 . birthday .compareTo( p2. birthday );

} }

package person; import

public class CompareAge

impleme nts ComparatorvPers on>{

@SuppressWarnings ("deprecation" ) @Override

public int compare(Pers on

pl , Pers on p2) {

// TODO 自动生成的方法存根

return new Integer( pl . age ).compareTo( System. out .println(

"姓名:"+person [ i ]. name+" 性别:"+person [ i ]. sex +" 年

龄:"+person [ i ]. age+"生日:"+person [ i ]. birthday );

newlnteger( p2. age));

} }

package import public

pers on; class Pers on Text

{ public static

// TODO void main( Str in g[] 自动生成的方法存根 args ) {

int n=5; Pers on[]

pers on [0]= new Pers on( "张三“， "4569", "1996 年6月6日", '男’，22); pers on [1]= new Pers on( "李四",

“1234",

"1995 年4月3日", '男’,23); pers on [2]= new Pers on( "王五", "2589", "1997 年3月5日", '男’,21); pers on [3]= new Pers on( "赵丽“， "3698",

"1998 年2月5日", '女',20);

pers on [4]= new Pers on( "宋月“， "5869", "1998 年1月 1日", '女',20); System. out .pri ntl n( “原来顺序为 :");

for (int i =0; i

■

System. out .pr in tl n( "姓名: :"+pers on [i]. name+"性别 :"+pers on

龄:"+pers on

}

System. Arrays. for (int

out .println( "\n 按姓名排序后顺序为 sort ( person , new CompareName()); i =0; i

pers on =new Pers on[ n];

age+" 生日："+person [ i ]. birthday

[i ]. );

[i ]. sex +"年

}

System. out .println( "\n 按年龄排序后顺序为 :");

Arrays. sort ( person , new CompareAge()); for (int i =0; i

System. out .println(

"姓名："+person [ i ]. name+" 性别："+person [ i ]. sex +" 年

龄:"+person [ i ]. age+"生日:"+person [ i ]. birthday );

}

System. out .println( "\n 按生日排序后顺序为 :"); Arrays. sort ( person , new CompareBirthday()); for (int i =0; i

System. out .println(

"姓名:"+person [ i ]. name+" 性别:"+person [ i ]. sex +" 年

龄:"+person [ i ]. age+"生日:"+person [ i ]. birthday );

} } }

实验结果：

2.首先定义基本几何图形接口( IShape ),然后定义IShape 的实现类Circle(圆 形)、Square (正

方形)和Triangle(三角形)。要求计算各种图形的面积和周长。

(提示：求三角形的面积用海伦公式：

S L

* (L a)*(L b )*(L c)，其中a,b,c

是三角形的边长，L=(a+b+c)/2 ，即周长的一半。) 源代码:

package jiekoushape;

public in terface IShape {

this . r = r ; }

public Stri ng getName() { return n ame;

public void setName(Stri ng this . name = name;

public double public double }

package jiekoushape; public class Circle area();

len gth();

impleme nts IShape{ private private Str ing double n ame; public

Circle(Str ing

super ();

this . name = name;

n ame, double r) {

public double area() {

// TODO自动生成的方法存根

return a* a;

}

@Override

public double len gth() {

// TODO自动生成的方法存根

return 4* a;

}

@Override

public String toString() {

// TODO自动生成的方法存根

}

}

package jiekoushape;

public class Trian gle impleme nts IShape{

private Str ing n ame;

private double a;

private double b;

private double c;

public Tria ngle(Stri ng n ame, double a, double b, double c) { super ();

this . name = name;

this . a = a;

this . b = b;

this . c = c;

}

public Stri ng getName() {

return n ame;

}

public void setName(Stri ng n ame) {

this . name = name;

}

public double getA() {

return a;

}

public void setA( double a) {

this . a = a;

}

public double getB() {

return b;

}

public void setB( double b) {

this . b = b; }

public double getC() {

return c; }

public void setC( double c) {

this . c = c; }

public double area() {

// TODOAuto-ge nerated method stub double l =( a+b+c)/2;

return Math. sqrt ( l *( l - a)*( l - b)*( l - c)); }

public double len gth() {

// TODOAuto-ge nerated method stub retur n a+b+c; }

@Override

public Stri ng toStri ng() {

// TODO 自动生成的方法存根 return name+"周长是："+length()+ "," +"面积是："+area();

} }

package jiekoushape; public class DemoIShape {

public static void main( Str in g[]

args ) {

// TODO 自动生成的方法存根

实验结果：

实验总结（结论或问题分析） ：

本次实验，主要是对接口、

https://www.doczj.com/doc/b05920733.html, ng 包中的基础类库和 java.util 包中的工具

类库的使用，其中最难得就是使用 Comparator对Person 类进行排序，通过

查阅资料了解了

Comparator 如何使用，受益匪浅。

IShape shape =n ull shape =new Circle( System. out .println( shape =new Square( System. out .println( shape =new Trian

gle( System. "圆形“ ,3);

shape .toString()); "正方形",4);

shape .toString()); "三角形",3, 4, 5) shape .toString());