Skip to content

Commit 887a856

Browse files
liyazhouliyazhou
committed
visitor
1 parent 24f7b7a commit 887a856

File tree

8 files changed

+112
-90
lines changed

8 files changed

+112
-90
lines changed

‎src/com/anxpp/designpattern/visitor/APPOwner.java‎

Lines changed: 15 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -1,16 +1,18 @@
11
package com.anxpp.designpattern.visitor;
2+
23
//具体访问者
3-
public class APPOwner implements Visitor{
4-
@Override
5-
public void visit(UserVIP user) {
6-
String estimation = user.getEstimation();
7-
if(estimation.length()>5)
8-
System.out.println("记录一条有效反馈：" + estimation);
9-
}
10-
@Override
11-
public void visit(UserOrdinary user) {
12-
String estimation = user.getEstimation();
13-
if(estimation.length()>10)
14-
System.out.println("记录一条有效反馈：" + estimation);
15-
}
4+
public class APPOwner implements Visitor {
5+
@Override
6+
public void visit(UserVIP user) {
7+
String estimation = user.getEstimation();
8+
if (estimation.length() > 5)
9+
System.out.println("记录一条有效反馈：" + estimation);
10+
}
11+
12+
@Override
13+
public void visit(UserOrdinary user) {
14+
String estimation = user.getEstimation();
15+
if (estimation.length() > 10)
16+
System.out.println("记录一条有效反馈：" + estimation);
17+
}
1618
}

‎src/com/anxpp/designpattern/visitor/Dispatch.java‎

Lines changed: 24 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -1,27 +1,32 @@
11
package com.anxpp.designpattern.visitor;
2+
23
//演示java的静态分派和动态分派
34
//结果会输出：Collection
45
//所以重载的分派是根据静态类型进行的
56
public class Dispatch {
6-
void print(FatherClass c){
7-
System.out.print("父类");
8-
}
9-
void print(ChildClass c){
10-
System.out.print("子类");
11-
}
12-
public static void main(String args[]){
13-
FatherClass child = new ChildClass();
14-
new Dispatch().print(child);
15-
child.print();
16-
}
7+
public static void main(String args[]) {
8+
FatherClass child = new ChildClass();
9+
new Dispatch().print(child);
10+
child.print();
11+
}
12+
13+
void print(FatherClass c) {
14+
System.out.print("父类");
15+
}
16+
17+
void print(ChildClass c) {
18+
System.out.print("子类");
19+
}
1720
}
18-
class FatherClass{
19-
void print(){
20-
System.out.println("父类");
21-
}
21+
22+
class FatherClass {
23+
void print() {
24+
System.out.println("父类");
25+
}
2226
}
23-
class ChildClass extends FatherClass{
24-
void print(){
25-
System.out.print("子类");
26-
}
27+
28+
class ChildClass extends FatherClass {
29+
void print() {
30+
System.out.print("子类");
31+
}
2732
}

‎src/com/anxpp/designpattern/visitor/MultiDispatch.java‎

Lines changed: 23 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -1,27 +1,31 @@
11
package com.anxpp.designpattern.visitor;
22

33
public class MultiDispatch {
4-
public static void main(String args[]){
5-
Father child = new Child();
6-
child.print();
7-
new Child().print(new Vistor());
8-
}
4+
public static void main(String args[]) {
5+
Father child = new Child();
6+
child.print();
7+
new Child().print(new Vistor());
8+
}
99
}
10-
class Father{
11-
void print(){
12-
System.out.println("父类");
13-
}
10+
11+
class Father {
12+
void print() {
13+
System.out.println("父类");
14+
}
1415
}
15-
class Child extends Father{
16-
void print(){
17-
System.out.print("子类");
18-
}
19-
void print(Vistor c){
20-
c.print(this);
21-
}
16+
17+
class Child extends Father {
18+
void print() {
19+
System.out.print("子类");
20+
}
21+
22+
void print(Vistor c) {
23+
c.print(this);
24+
}
2225
}
23-
class Vistor {
24-
public void print(Child child){
25-
child.print();
26+
27+
class Vistor {
28+
public void print(Child child) {
29+
child.print();
2630
}
2731
}

‎src/com/anxpp/designpattern/visitor/TestUse.java‎

Lines changed: 12 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -4,16 +4,16 @@
44
import java.util.Iterator;
55

66
public class TestUse {
7-
public static void main(String args[]){
8-
Visitor appOwner = new APPOwner();
9-
ArrayList<User> users = new ArrayList<User>();
10-
users.add(new UserOrdinary("普通用户短反馈"));
11-
users.add(new UserOrdinary("这是一个普通用户的比较长的反馈"));
12-
users.add(new UserVIP("VIP用户的短反馈"));
13-
users.add(new UserVIP("VIP用户的比较长的反馈反馈"));
14-
Iterator<User> iterator = users.iterator();
15-
while(iterator.hasNext()){
16-
iterator.next().accept(appOwner);
17-
}
18-
}
7+
public static void main(String args[]) {
8+
Visitor appOwner = new APPOwner();
9+
ArrayList<User> users = new ArrayList<User>();
10+
users.add(new UserOrdinary("普通用户短反馈"));
11+
users.add(new UserOrdinary("这是一个普通用户的比较长的反馈"));
12+
users.add(new UserVIP("VIP用户的短反馈"));
13+
users.add(new UserVIP("VIP用户的比较长的反馈反馈"));
14+
Iterator<User> iterator = users.iterator();
15+
while (iterator.hasNext()) {
16+
iterator.next().accept(appOwner);
17+
}
18+
}
1919
}

‎src/com/anxpp/designpattern/visitor/User.java‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,6 @@
11
package com.anxpp.designpattern.visitor;
2+
23
//抽象元素
34
public interface User {
4-
void accept(Visitor visitor);
5+
void accept(Visitor visitor);
56
}

‎src/com/anxpp/designpattern/visitor/UserOrdinary.java‎

Lines changed: 16 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -1,15 +1,19 @@
11
package com.anxpp.designpattern.visitor;
2+
23
//普通用户，具体元素
3-
public class UserOrdinary implements User{
4-
String estimation;
5-
public UserOrdinary(String estimation){
6-
this.estimation = estimation;
7-
}
8-
@Override
9-
public void accept(Visitor visitor) {
10-
visitor.visit(this);
11-
}
12-
String getEstimation(){
13-
return estimation;
14-
}
4+
public class UserOrdinary implements User {
5+
String estimation;
6+
7+
public UserOrdinary(String estimation) {
8+
this.estimation = estimation;
9+
}
10+
11+
@Override
12+
public void accept(Visitor visitor) {
13+
visitor.visit(this);
14+
}
15+
16+
String getEstimation() {
17+
return estimation;
18+
}
1519
}

‎src/com/anxpp/designpattern/visitor/UserVIP.java‎

Lines changed: 16 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -1,15 +1,19 @@
11
package com.anxpp.designpattern.visitor;
2+
23
//VIP用户，具体元素
3-
public class UserVIP implements User{
4-
String estimation;
5-
public UserVIP(String estimation){
6-
this.estimation = estimation;
7-
}
8-
@Override
9-
public void accept(Visitor visitor) {
10-
visitor.visit(this);
11-
}
12-
String getEstimation(){
13-
return estimation;
14-
}
4+
public class UserVIP implements User {
5+
String estimation;
6+
7+
public UserVIP(String estimation) {
8+
this.estimation = estimation;
9+
}
10+
11+
@Override
12+
public void accept(Visitor visitor) {
13+
visitor.visit(this);
14+
}
15+
16+
String getEstimation() {
17+
return estimation;
18+
}
1519
}

‎src/com/anxpp/designpattern/visitor/Visitor.java‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
11
package com.anxpp.designpattern.visitor;
2+
23
//抽象访问者
34
public interface Visitor {
4-
void visit(UserVIP user);
5-
void visit(UserOrdinary user);
5+
void visit(UserVIP user);
6+
7+
void visit(UserOrdinary user);
68
}

0 commit comments

Comments
 (0)