From 76d7dcd0dfabc917b0b703ea54a62e696e11fe79 Mon Sep 17 00:00:00 2001
From: terry <724796052@qq.com>
Date: Sun, 3 Jul 2022 09:56:04 +0800
Subject: [PATCH] visitor pattern

---
 src/main/java/visitor/CPU.java            | 13 +++++++++++++
 src/main/java/visitor/CompanyVisitor.java | 20 ++++++++++++++++++++
 src/main/java/visitor/Computer.java       | 13 +++++++++++++
 src/main/java/visitor/ComputerPart.java   |  6 ++++++
 src/main/java/visitor/Main.java           | 14 ++++++++++++++
 src/main/java/visitor/MainBoard.java      | 13 +++++++++++++
 src/main/java/visitor/Memory.java         | 13 +++++++++++++
 src/main/java/visitor/StudentVisitor.java | 19 +++++++++++++++++++
 src/main/java/visitor/Visitor.java        |  7 +++++++
 9 files changed, 118 insertions(+)
 create mode 100644 src/main/java/visitor/CPU.java
 create mode 100644 src/main/java/visitor/CompanyVisitor.java
 create mode 100644 src/main/java/visitor/Computer.java
 create mode 100644 src/main/java/visitor/ComputerPart.java
 create mode 100644 src/main/java/visitor/Main.java
 create mode 100644 src/main/java/visitor/MainBoard.java
 create mode 100644 src/main/java/visitor/Memory.java
 create mode 100644 src/main/java/visitor/StudentVisitor.java
 create mode 100644 src/main/java/visitor/Visitor.java

diff --git a/src/main/java/visitor/CPU.java b/src/main/java/visitor/CPU.java
new file mode 100644
index 0000000..ef9d44d
--- /dev/null
+++ b/src/main/java/visitor/CPU.java
@@ -0,0 +1,13 @@
+package visitor;
+
+public class CPU implements ComputerPart{
+    @Override
+    public void accept(Visitor v) {
+        v.visitCPU(this);
+    }
+
+    @Override
+    public double getPrice() {
+        return 1880;
+    }
+}
diff --git a/src/main/java/visitor/CompanyVisitor.java b/src/main/java/visitor/CompanyVisitor.java
new file mode 100644
index 0000000..ec72fc9
--- /dev/null
+++ b/src/main/java/visitor/CompanyVisitor.java
@@ -0,0 +1,20 @@
+package visitor;
+
+public class CompanyVisitor implements Visitor{
+    double totalPrice = 0;
+    @Override
+    public void visitCPU(CPU cpu) {
+        totalPrice += cpu.getPrice() * 0.7;
+    }
+
+    @Override
+    public void visitMemory(Memory memory) {
+        totalPrice += memory.getPrice() * 0.7;
+
+    }
+
+    @Override
+    public void visitMainBoard(MainBoard mainBoard) {
+        totalPrice += mainBoard.getPrice() * 0.7;
+    }
+}
diff --git a/src/main/java/visitor/Computer.java b/src/main/java/visitor/Computer.java
new file mode 100644
index 0000000..0443620
--- /dev/null
+++ b/src/main/java/visitor/Computer.java
@@ -0,0 +1,13 @@
+package visitor;
+
+public class Computer {
+    private ComputerPart cpu = new CPU();
+    private ComputerPart memory = new Memory();
+    private ComputerPart mainBoard = new MainBoard();
+
+    public void accept(Visitor v){
+        this.cpu.accept(v);
+        this.memory.accept(v);
+        this.mainBoard.accept(v);
+    }
+}
diff --git a/src/main/java/visitor/ComputerPart.java b/src/main/java/visitor/ComputerPart.java
new file mode 100644
index 0000000..8209580
--- /dev/null
+++ b/src/main/java/visitor/ComputerPart.java
@@ -0,0 +1,6 @@
+package visitor;
+
+public interface ComputerPart {
+    void accept(Visitor v);
+    double getPrice();
+}
diff --git a/src/main/java/visitor/Main.java b/src/main/java/visitor/Main.java
new file mode 100644
index 0000000..a669013
--- /dev/null
+++ b/src/main/java/visitor/Main.java
@@ -0,0 +1,14 @@
+package visitor;
+
+public class Main {
+    public static void main(String[] args) {
+        Computer computer = new Computer();
+        StudentVisitor visitor = new StudentVisitor();
+        computer.accept(visitor);
+        System.out.println(visitor.totalPrice);
+
+        CompanyVisitor visitor2 = new CompanyVisitor();
+        computer.accept(visitor2);
+        System.out.println(visitor2.totalPrice);
+    }
+}
diff --git a/src/main/java/visitor/MainBoard.java b/src/main/java/visitor/MainBoard.java
new file mode 100644
index 0000000..7987fa4
--- /dev/null
+++ b/src/main/java/visitor/MainBoard.java
@@ -0,0 +1,13 @@
+package visitor;
+
+public class MainBoard implements ComputerPart{
+    @Override
+    public void accept(Visitor v) {
+        v.visitMainBoard(this);
+    }
+
+    @Override
+    public double getPrice() {
+        return 1200.5;
+    }
+}
diff --git a/src/main/java/visitor/Memory.java b/src/main/java/visitor/Memory.java
new file mode 100644
index 0000000..473218a
--- /dev/null
+++ b/src/main/java/visitor/Memory.java
@@ -0,0 +1,13 @@
+package visitor;
+
+public class Memory implements ComputerPart{
+    @Override
+    public void accept(Visitor v) {
+        v.visitMemory(this);
+    }
+
+    @Override
+    public double getPrice() {
+        return 800;
+    }
+}
diff --git a/src/main/java/visitor/StudentVisitor.java b/src/main/java/visitor/StudentVisitor.java
new file mode 100644
index 0000000..01da064
--- /dev/null
+++ b/src/main/java/visitor/StudentVisitor.java
@@ -0,0 +1,19 @@
+package visitor;
+
+public class StudentVisitor implements Visitor{
+    double totalPrice = 0;
+    @Override
+    public void visitCPU(CPU cpu) {
+        totalPrice += cpu.getPrice() * 0.9;
+    }
+
+    @Override
+    public void visitMemory(Memory memory) {
+        totalPrice += memory.getPrice() * 0.8;
+    }
+
+    @Override
+    public void visitMainBoard(MainBoard mainBoard) {
+        totalPrice += mainBoard.getPrice() * 0.95;
+    }
+}
diff --git a/src/main/java/visitor/Visitor.java b/src/main/java/visitor/Visitor.java
new file mode 100644
index 0000000..149f926
--- /dev/null
+++ b/src/main/java/visitor/Visitor.java
@@ -0,0 +1,7 @@
+package visitor;
+
+public interface Visitor {
+    void visitCPU(CPU cpu);
+    void visitMemory(Memory memory);
+    void visitMainBoard(MainBoard mainBoard);
+}