这是我的代码package cse.某某某;
import java.util.*;
class YMD
{
static int year,month,day;
YMD(int year,int month,int day)//在构造函数时,需给出数
{
this.year=year;
this.month=month;
this.day=day;
}
public static int countYear(){
Calendar calendar=Calendar.getInstance();
calendar.setTime(new Date());//用当前的时间初始化
return (calendar.get(Calendar.YEAR));
}
public static void printbirthday(){
System.out.println("该人出生日期:"+year+"年"+month+"月"+day+"日");
}
public static void printyear(){
System.out.println("今年的年份为:"+countYear());
}
public static int countAge(){
return(countYear()-year);
}
}public class KY{
public static void main(String args[]){
String s="某某某";
YMD lxd =new YMD(2000,1,1);
System.out.println("姓名"+s+"年龄"+lxd.countAge());
lxd.printbirthday();
lxd.printyear();
}
}新手学习不久 请问 这个运行为什么显示java.lang.NoClassDefFoundError: KY
Caused by: java.lang.ClassNotFoundException: KY
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Exception in thread "main" 这是什么意思啊 = = 谢谢大家!!
import java.util.*;
class YMD
{
static int year,month,day;
YMD(int year,int month,int day)//在构造函数时,需给出数
{
this.year=year;
this.month=month;
this.day=day;
}
public static int countYear(){
Calendar calendar=Calendar.getInstance();
calendar.setTime(new Date());//用当前的时间初始化
return (calendar.get(Calendar.YEAR));
}
public static void printbirthday(){
System.out.println("该人出生日期:"+year+"年"+month+"月"+day+"日");
}
public static void printyear(){
System.out.println("今年的年份为:"+countYear());
}
public static int countAge(){
return(countYear()-year);
}
}public class KY{
public static void main(String args[]){
String s="某某某";
YMD lxd =new YMD(2000,1,1);
System.out.println("姓名"+s+"年龄"+lxd.countAge());
lxd.printbirthday();
lxd.printyear();
}
}新手学习不久 请问 这个运行为什么显示java.lang.NoClassDefFoundError: KY
Caused by: java.lang.ClassNotFoundException: KY
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Exception in thread "main" 这是什么意思啊 = = 谢谢大家!!
你在开始>运行 打 cmd进去之后打 javac 看看 是否成功安装jdk