責(zé)任鏈模式是對(duì)象的行為模式。使多個(gè)對(duì)象都有機(jī)會(huì)處理請(qǐng)求，從而避免請(qǐng)求的發(fā)送者和接受者直接的耦合關(guān)系。
public abstract class Handler {
protected Handler successor;
public abstract void handlerRequest(String condition);
protected Handler getSuccessor() {
return successor;
}
public void setSuccessor(Handler successor) {
this.successor = successor;
}
}
public class ConcreteHandler1 extends Handler{
@Override
public void handlerRequest(String condition) {
// TODO Auto-generated method stub
// 如果是自己的責(zé)任，就自己處理，負(fù)責(zé)傳給下家處理
if(condition.equals("ConcreteHandler1")){
System.out.println( "ConcreteHandler1 handled ");
return ;
}else{
System.out.println( "ConcreteHandler1 passed ");
getSuccessor().handlerRequest(condition);
}
}
public class ConcreteHandler2 extends Handler{
@Override
public void handlerRequest(String condition) {
// TODO Auto-generated method stub
// 如果是自己的責(zé)任，就自己處理，負(fù)責(zé)傳給下家處理
if(condition.equals("ConcreteHandler2")){
System.out.println( "ConcreteHandler2 handled ");
return ;
}else{
System.out.println( "ConcreteHandler2 passed ");
getSuccessor().handlerRequest(condition);
}
}
}
public class ConcreteHandlerN extends Handler{
@Override
public void handlerRequest(String condition) {
// TODO Auto-generated method stub
System.out.println( "ConcreteHandlerN handled");
}
}
//測(cè)試
Handler handler1 = new ConcreteHandler1();
Handler handler2 = new ConcreteHandler2();
Handler handlern = new ConcreteHandlerN();
//鏈起來(lái)
handler1.setSuccessor(handler2);
handler2.setSuccessor(handlern);
//假設(shè)這個(gè)請(qǐng)求是ConcreteHandler2的責(zé)任
handler1.handlerRequest("ConcreteHandler2");
public static void main(String[] args) {
// TODO Auto-generated method stub
Handler handler1 = new ConcreteHandler1();
Handler handler2 = new ConcreteHandler2();
Handler handlern = new ConcreteHandlerN();
//鏈起來(lái)
handler1.setSuccessor(handler2);
handler2.setSuccessor(handlern);
//假設(shè)這個(gè)請(qǐng)求是ConcreteHandler2的責(zé)任
handler1.handlerRequest("ConcreteHandler2");
}
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