因?yàn)轭}目要求拷貝Example1-10.java文件從Java_Source到Java目錄下,可以把數(shù)字拼到文件名的字符串中,從而把Example1-10.java文件,一個(gè)一個(gè)復(fù)制到目標(biāo)目錄下.

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完整的Java程序如下
import java.io.File;
import java.IoException;
public class test{
pubilc static void main(String args[])throws IoException{
for(int i=1;i=10;i++){
String S1 = "G:/Java_Source/Example"+i+".java";
String S2 = "G:/Java/Example"+i+".java";
File Source = new File(S1);
File dest = new File(S2);
java.nio.file.Files.copy(Source.toPath(),dest.toPath());
}
System.out.printIn("File copy");
}
}
我寫了一個(gè),內(nèi)容比較簡單的。代碼如下:public class AnimalTest {
Animal animal;
public void eat(Animal animal){
animal.eat();
}
public void walk(Animal animal){
animal.walk();
}
public static void main(String args[]){
Animal animal=new Animal("animal");
Wolf w=new Wolf("wolf");
Goat g=new Goat("goat");
AnimalTest at=new AnimalTest();
at.eat(animal);
at.eat(w);
at.eat(g);
at.walk(animal);
at.walk(w);
at.walk(g);
}
}
class Animal {
String name;
public Animal(String name){
this.name=name;
}
public Animal(){}
public void setName(String name){
this.name=name;
}
public String getName(){
return name;
}
public void eat(){
System.out.println("animal eat");
}
public void walk(){
System.out.println("animal walk");
}
public String toString(){
return name;
}
}class Wolf extends Animal {
public Wolf(String name){
super(name);
}
public Wolf(){}
public void eat(){
System.out.println("wolf eat meat");
}
public void walk(){
System.out.println("wolf walk");
}
public String toString(){
return name;
}
}class Goat extends Animal {
public Goat(String name){
super(name);
}
public Goat(){}
public void eat(){
System.out.println("goat eat grass");
}
public void walk(){
System.out.println("goat walk");
}
public String toString(){
return name;
}
}
你好!
這就是個(gè)鏈接數(shù)據(jù)庫的工具類啊。
DB.getResultSet(DB.getConn().getState(),"select
*
from
eval");
拿數(shù)據(jù)庫連接然后執(zhí)行就行了
如有疑問,請追問。
首先for循環(huán)應(yīng)該是執(zhí)行5次
if((++x2)||(++y2)) 應(yīng)該執(zhí)行5次
第一次執(zhí)行過后:x = 1, y = 1
第二次執(zhí)行過后:x = 2, y = 2
第三次執(zhí)行的時(shí)候:先執(zhí)行 ++X 2,這里先執(zhí)行++X
x的值就變成了3,這時(shí)候++x2 這個(gè)條件就成立了,在邏輯符號(hào)或者(||)中,如果前面的條件成立,就說明這個(gè)邏輯運(yùn)算表達(dá)式已經(jīng)是true了,后面的++y2就不再執(zhí)行了,所以之后++y就不再執(zhí)行了,所以結(jié)果是y = 2
a href="your target url"Link/a
如果在servlet中:
PrintWriter?out?=?res.getWriter();
out.println("a?href='your?target?url'Link/a");
如果是連接自己項(xiàng)目中的,請注意相對路徑的寫法。建議加上context path.
package threadgroup;
class ThreadDemo3 extends Thread {
private String name;
private int delay;
public ThreadDemo3(String sname, int i_delay) {
name = sname;
delay = i_delay;
}
public void run() {
try {
sleep(delay);
} catch (InterruptedException e) {
}
System.out.println("多線程測試!\n" + name + "\n" + delay);
}
}
public class testMyThread {
public static void main(String[] args) {
ThreadDemo3 th1,th2,th3;
th1 = new ThreadDemo3("線程1", (int) (Math.random() * 900));
th2 = new ThreadDemo3("線程2", (int) (Math.random() * 900));
th3 = new ThreadDemo3("線程3", (int) (Math.random() * 900));
th1.start();
th2.start();
th3.start();
}
}
package threadgroup;
public class threadDemo {
public static void main(String[] args) {
Thread t = Thread.currentThread();
t.setName("你好嗎?");
System.out.println("正在進(jìn)行的Thread是:" + t);
try {
for (int i = 0; i 5; i++) {
System.out.println("我不叫穆繼超" + i);
Thread.sleep(3000);
}
} catch (Exception e) {
// TODO: handle exception
System.out.println("Thread has wrong" + e.getMessage());
}
}
}
package threadgroup;
public class threadDemo2 implements Runnable {
public threadDemo2() {
Thread t1 = Thread.currentThread();
t1.setName("第一個(gè)主進(jìn)程");
System.out.println("正在運(yùn)行" + t1);
Thread t2 = new Thread(this, "");
System.out.println("在創(chuàng)建一個(gè)進(jìn)程");
t2.start();
try {
System.out.println("使他進(jìn)入第一個(gè)睡眠狀態(tài)");
Thread.sleep(2000);
} catch (InterruptedException e) {
System.out.println("Thread has wrong" + e.getMessage());
}
System.out.println("退出第一個(gè)進(jìn)程");
}
public void run() {
try {
for (int i = 0; i 5; i++) {
System.out.println("進(jìn)程" + i);
Thread.sleep(3000);
}
} catch (InterruptedException e) {
// TODO: handle exception
System.out.println("Thread has wrong" + e.getMessage());
}
System.out.println("退出第二個(gè)進(jìn)程");
}
public static void main(String[] args) {
new threadDemo2();
}
}
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