PTA JAVA编程题汇总（三）

class Rectangle
{
double w,h;
public Rectangle(double w1,double h1){w=w1;h=h1;}
public double getArea()
{
return w*h;
}
public double getPerimeter()
{
return 2*(w+h);
}
}

class RPentagon extends shape
{
private double a;
@Override
public double getArea() {
return 5*Math.pow(a,2)/(4*Math.tan(36*Math.PI/180));
}
@Override
public double getPerimeter() {
return 5*a;
}
public RPentagon(double a1)
{
a=a1;
}
}

import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner cin = new Scanner(System.in);
TreeMap<String,Long> map = new TreeMap<>(((o1, o2) -> {
String s1,s2;
s1 = (String)o1;
s2 = (String)o2;
return s1.compareTo(s2);
}));
String pinyin;
String[] data = new String[2];
while(true){
pinyin = cin.nextLine();
if(pinyin.substring(0,3).equals("end")){
break;
}
data = pinyin.split(" ");
map.put(data[0],Long.parseLong(data[1]));
}
while(true){
pinyin = cin.nextLine();
if(pinyin.substring(0,3).equals("end")){
break;
}
data = pinyin.split(" ");
map.put(data[0],Long.parseLong(data[1]));
}
Set<String> keys = map.keySet();
for(String key:keys){
System.out.println(key+" "+map.get(key));
}
}
}

import java.util.Scanner;
import java.util.TreeSet;
public class Main {

public static void main(String[] args) {
TreeSet<String> st = new TreeSet<>();
Scanner sc = new Scanner(System.in);
int count = sc.nextInt();
while (count > 0) {
String th = sc.next();
st.add(th);
sc.nextLine();
count--;
}
for (String string : st) {
System.out.println(string);
}
}
}

class  Circle extends shape
{
private double a;
@Override
public double getArea() {
// TODO 自动生成的方法存根
return Math.PI*a*a;
}
@Override
public double getPerimeter() {
// TODO 自动生成的方法存根
return 2*a*Math.PI;
}
public  Circle(double r)
{
a=r;
}
}

import java.util.InputMismatchException;
import java.util.Scanner;
import java.text.DecimalFormat;
public class Main {
public static void main(String[] args) {
Scanner in =new Scanner(System.in);
int m,n;
while(true){
try{
m=in.nextInt();
n=in.nextInt();
System.out.println("Sum is "+(m+n));
break;

}catch(InputMismatchException e){
System.out.println("Incorrect input and re-enter two integers:");
in.nextLine();
continue;
}
}
}
}