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import java.util.Calendar;
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//这是问题（1）的函数
public static Boolean isLegal(int year,int month,int day){
boolean run=false;
if(month1||month12||day1||day31) return false;
if((year%4==0)(year%100!=0)||(year%400==0)) //是否是闰年
run=true;
switch(month){
case 2:
if(run){
if(day29) return false;
}
else{
if(day28) return false;
}
break;
case 4:
case 6:
case 9:
case 11:if(day30) return false;
}
return true;
}
//这是第（2）问的代码
Calendar cld = Calendar.getInstance();
cld.set(2009, 0,18);//月份是从0开始的
cld.set(Calendar.DAY_OF_YEAR, cld.get(Calendar.DAY_OF_YEAR)+365);
System.out.println(cld.getTime());
//结果是：Mon Jan 18 13:50:40 CST 2010
//下面是第三问的代码
Calendar cld1 = Calendar.getInstance();
cld1.set(2009, 0,18);//月份是从0开始的
Calendar cld2 = Calendar.getInstance();
cld2.set(2008, 0,18);
long d=cld1.getTimeInMillis()-cld2.getTimeInMillis();
d=d/1000/60/60/24;
System.out.println(d);
//结果是366
写了一个代码，代码如下，可以进行参考
public class sum {
public static void main(String[] args) {
//创建一个Scanner的对象input
Scanner input = new Scanner(System.in);
//提示用户输入数据
System.out.print("请输入一个整数");
//将输入的值赋给n
int n = input.nextInt();
//定义变量接收计算后的和
int sum = 0;
//利用循环进行求和
for (int i = 0; i = n; i++) {
sum+=i;
}
//输出最后的和
System.out.println("从0一直到"+n+"的所有整数的和是:"+sum);
}
}
class NoLowerLetterException extends Exception {
public NoLowerLetterException(String msg) {
super(msg);
}
}
class NoDigitException extends Exception {
public NoDigitException(String msg) {
super(msg);
}
}
class People {
void printLetter(char c) {
if (c = 'a' c = 'z') {
System.out.println(c);
} else {
try {
throw new NoLowerLetterException(String.valueOf(c));
} catch (NoLowerLetterException e) {
e.printStackTrace();
}
}
}
void printDigit(char c) {
if (c = '0' c = '9') {
System.out.println(c);
} else {
try {
throw new NoDigitException(String.valueOf(c));
} catch (NoDigitException e) {
e.printStackTrace();
}
}
}
}
public class ExceptionExample {
public static void main(String args[]) {
People people = new People();
for (int i = 0; i 128; i++) {
// 【代码5】
// //将i转换为char类型，执行people.printLetter()方法，如果出现异常则捕获，并输出异常的错误信息！
people.printLetter((char) i);
}
for (int i = 0; i 128; i++) {
// 【代码6】 //将i转换为char类型，执行people. printDigit
// ()方法，如果出现异常则捕获，并输出异常的错误信息！
people.printDigit((char) i);
}
}
}
Media类：
import java.util.Scanner;
/**
* @author Administrator
*
*/
public class Media {
private String name;
private String author;
private String publish;
private double price;
/**
* @throws Exception
*/
public Media() throws Exception
{
@SuppressWarnings("resource")
Scanner scanner = new Scanner(System.in);
System.out.println("请输入名称：");
setName(scanner.nextLine());
System.out.println("请输入作者：");
setAuthor(scanner.nextLine());
System.out.println("请输入出版社：");
setPublish(scanner.nextLine());
System.out.println("请输入价格：");
setPrice(scanner.nextDouble());
scanner.close();
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the author
*/
public String getAuthor() {
return author;
}
/**
* @param author the author to set
*/
public void setAuthor(String author) {
this.author = author;
}
/**
* @return the publish
*/
public String getPublish() {
return publish;
}
/**
* @param publish the publish to set
*/
public void setPublish(String publish) {
this.publish = publish;
}
/**
* @return the price
*/
public double getPrice() {
return price;
}
/**
* @param price the price to set
*/
public void setPrice(double price) {
this.price = price;
}
}
public class Book extends Media {
/**
* @throws Exception
*
*/
public Book() throws Exception{
super();
System.out.println("I am a book!");
}
}
public class Cd extends Media {
/**
*
* @throws Exception
*/
public Cd() throws Exception{
super();
System.out.println("I am a cd!");
}
}
class Printer {
public String type;
public String manner;
public Printer(){};
public Printer(String type,String manner){
this.type=type;
this.manner=manner;
}
public void startup(){
System.out.println("启动普通打印机");
}
public void print(){
System.out.println("普通打印机打印");
}
}
class LaserPrinter extends Printer{
public void print(){
System.out.println("激光打印机打印");
}
public void close(){
System.out.println("激光打印机关闭");
}
}
public class Test{
public static void main(String[] args){
Printer p1=new Printer();
Printer p2=new Printer("123","方式1");
p1.startup();
p1.print();
LaserPrinter j1= new LaserPrinter();
j1.startup();
j1.print();
j1.close();
}
}