spring是通过依赖注入(Dependency Injection )实现的IoC
IoC容器
* 必须被理的对象定义到spring配置文g?br /> * 必须定义constructor或者setterҎ(gu)Q让spring对象注入进?br />
AOP : Aspect Oriented Programming
spring带来?jin)一U编E方式，面向切面的编E?br />
AOP是一个概?br />
在一个程序中分离一个功能，q种功能的实现是与程序不相关的类?br /> 同时能够使很多类׃nq个功能?br />
x(chng)是他的主要点Q要x(chng)某个功能Q要x(chng)切入炏V?br />
实现AOP?点：(x)
1、PointcutQ切入点Q是一个范?--表达?br /> 2、AdviceQ具体实玎ͼ(j)功能攑ֈ那个Ҏ(gu)
spring对hibernate的支?br />
注入SessionFactory到spring配置文g?br />
<Bean id="SessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactory">
<property nema="configLocation">
<value>classpath:hibernate.cfg.xml</value>
</property>
</Bean>
]]>
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request
HttpServletResponse response) throws Exception {
return null;
}
׃我是手写的，l果形参的顺序没写对?br />
恶心(j)?jin)我一下午?br />
q有异常的方法也要一栗?
ActionMapping mapping,
ActionForm form,
HttpServletRequest request
HttpServletResponse response) throws Exception {
return null;
}
]]>
一、waitQ）(j)和sleepQ）(j)区别Q?br /> waitҎ(gu)是ObjectcM的方法?br /> sleepҎ(gu)是ThreadcM的方法?br />
当线E进入wait时别的线E可以访问锁定的对象?br /> 当线E进入sleep时别的线E不能访问锁定的对象?br />
二、写一个死锁?br />
class Demo implements Runnable {
int flag ;
static Object o1 = new Object(), o2 = new Object();
public void run(){
System.out.println("U程" + flag + "在运行。?/span>");
if(flag == 1){
synchronized(o1){
try {
Thread.sleep(100);
} catch(InterruptedException e) {
e.printStackTrace();
}
System.out.println("U程1 --> o1");
synchronized(o2){
System.out.println("U程1 --> o2");
}
}
}
if(flag == 2){
synchronized(o2){
try {
Thread.sleep(100);
} catch(InterruptedException e) {
e.printStackTrace();
}
System.out.println("U程2 --> o2");
synchronized(o1){
System.out.println("U程2 --> o1");
}
}
}
}
}
int flag ;
static Object o1 = new Object(), o2 = new Object();
public void run(){
System.out.println("U程" + flag + "在运行。?/span>");
if(flag == 1){
synchronized(o1){
try {
Thread.sleep(100);
} catch(InterruptedException e) {
e.printStackTrace();
}
System.out.println("U程1 --> o1");
synchronized(o2){
System.out.println("U程1 --> o2");
}
}
}
if(flag == 2){
synchronized(o2){
try {
Thread.sleep(100);
} catch(InterruptedException e) {
e.printStackTrace();
}
System.out.println("U程2 --> o2");
synchronized(o1){
System.out.println("U程2 --> o1");
}
}
}
}
}
l果D死锁?br />
U程1在运行。?br />
U程2在运行。?br />
U程1 --> o1
U程2 --> o2
不能l箋(hu)q行?br />
U程2 --> o2
2个ObjectcMؓ(f)staticQ说明他们锁定的是同2个对象；
三、Producer和Consumer的问?br /> 涉及(qing)?jin)waitҎ(gu)和nofityҎ(gu)
public class ProducerConsumer {
public static void main(String[] args) {
SyncStack ss = new SyncStack();
Producer p = new Producer(ss);
Consumer c = new Consumer(ss);
new Thread(p).start();
new Thread(c).start();
}
}
class WoTou {
int id;
WoTou(int id) {
this.id = id;
}
public String toString() {
return "WoTou : " + id;
}
}
class SyncStack {
int index = 0;
WoTou[] arrWT = new WoTou[6];
public synchronized void push(WoTou wt) {
while(index == arrWT.length) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.notifyAll();
arrWT[index] = wt;
index ++;
}
public synchronized WoTou pop() {
while(index == 0) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.notifyAll();
index--;
return arrWT[index];
}
}
class Producer implements Runnable {
SyncStack ss = null;
Producer(SyncStack ss) {
this.ss = ss;
}
public void run() {
for(int i=0; i<20; i++) {
WoTou wt = new WoTou(i);
ss.push(wt);
System.out.println("生?jin)?x)" + wt);
try {
Thread.sleep((int)(Math.random() * 200));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
class Consumer implements Runnable {
SyncStack ss = null;
Consumer(SyncStack ss) {
this.ss = ss;
}
public void run() {
for(int i=0; i<20; i++) {
WoTou wt = ss.pop();
System.out.println("消费? " + wt);
try {
Thread.sleep((int)(Math.random() * 1000));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) {
SyncStack ss = new SyncStack();
Producer p = new Producer(ss);
Consumer c = new Consumer(ss);
new Thread(p).start();
new Thread(c).start();
}
}
class WoTou {
int id;
WoTou(int id) {
this.id = id;
}
public String toString() {
return "WoTou : " + id;
}
}
class SyncStack {
int index = 0;
WoTou[] arrWT = new WoTou[6];
public synchronized void push(WoTou wt) {
while(index == arrWT.length) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.notifyAll();
arrWT[index] = wt;
index ++;
}
public synchronized WoTou pop() {
while(index == 0) {
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.notifyAll();
index--;
return arrWT[index];
}
}
class Producer implements Runnable {
SyncStack ss = null;
Producer(SyncStack ss) {
this.ss = ss;
}
public void run() {
for(int i=0; i<20; i++) {
WoTou wt = new WoTou(i);
ss.push(wt);
System.out.println("生?jin)?x)" + wt);
try {
Thread.sleep((int)(Math.random() * 200));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
class Consumer implements Runnable {
SyncStack ss = null;
Consumer(SyncStack ss) {
this.ss = ss;
}
public void run() {
for(int i=0; i<20; i++) {
WoTou wt = ss.pop();
System.out.println("消费? " + wt);
try {
Thread.sleep((int)(Math.random() * 1000));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
]]>
class Test2 {
public static void main(String args[]) {
Dog d1 = new Dog(1);
Dog d2 = new Dog(1);
Dog d3 = new Dog(2);
System.out.println(d1 == d2);//false
System.out.println(d1.equals(d2));//true
System.out.println(d1.equals(d3));//false
}
}
class Dog {
private int i;
Dog(int i) {
this.i = i;
}
public boolean equals(Object o) {
if(o != null) {
if(o instanceof Dog) { //判断传过来的 对象o 是否属于Dogcd?/span>
Dog d = (Dog)o; //把对象o强制转换成Dog对象cd
if(this.i == d.i) {
return true;
}
}
}
return false;
}
}
public static void main(String args[]) {
Dog d1 = new Dog(1);
Dog d2 = new Dog(1);
Dog d3 = new Dog(2);
System.out.println(d1 == d2);//false
System.out.println(d1.equals(d2));//true
System.out.println(d1.equals(d3));//false
}
}
class Dog {
private int i;
Dog(int i) {
this.i = i;
}
public boolean equals(Object o) {
if(o != null) {
if(o instanceof Dog) { //判断传过来的 对象o 是否属于Dogcd?/span>
Dog d = (Dog)o; //把对象o强制转换成Dog对象cd
if(this.i == d.i) {
return true;
}
}
}
return false;
}
}
]]>
1.选择排序
class NumSort
{
public static void main(String[] args)
{
int [] a = new int[args.length];
for(int i=0; i<a.length ; i++)
{
a[i] = Integer.parseInt(args[i]);
}
print(a);
selectSort(a);
print(a);
}
private static void selectSort(int [] a)
{
for(int i=0; i<a.length; i++)
{
for(int j=i+1; j<a.length; j++)
{
if(a[i] > a[j])
{
int temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
}
}
private static void print(int [] a)
{
for(int i=0; i<a.length ; i++)
{
System.out.print(a[i] + " ");
}
System.out.println();
}
}
{
public static void main(String[] args)
{
int [] a = new int[args.length];
for(int i=0; i<a.length ; i++)
{
a[i] = Integer.parseInt(args[i]);
}
print(a);
selectSort(a);
print(a);
}
private static void selectSort(int [] a)
{
for(int i=0; i<a.length; i++)
{
for(int j=i+1; j<a.length; j++)
{
if(a[i] > a[j])
{
int temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
}
}
private static void print(int [] a)
{
for(int i=0; i<a.length ; i++)
{
System.out.print(a[i] + " ");
}
System.out.println();
}
}
2.冒(chng)排序
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