multi-class-demo

JavaDemo/multiclass-demo/Makefile

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+# Makefile for multiclass-demo Java project
+
+# Java compiler and options
+JAVAC = javac
+JAVA = java
+JFLAGS = -g
+
+# Source and build directories
+SRC_DIR = src
+BUILD_DIR = build
+
+# Find all Java source files
+SOURCES = $(shell find $(SRC_DIR) -name "*.java")
+CLASSES = $(SOURCES:$(SRC_DIR)/%.java=$(BUILD_DIR)/%.class)
+
+# Main class
+MAIN_CLASS = com.example.Application
+
+# Default target
+.PHONY: all
+all: compile
+
+# Compile all Java source files
+.PHONY: compile
+compile:
+	@mkdir -p $(BUILD_DIR)
+	$(JAVAC) $(JFLAGS) -sourcepath $(SRC_DIR) -d $(BUILD_DIR) $(SOURCES)
+	@echo "Compilation completed successfully!"
+
+# Run the application
+.PHONY: run
+run: compile
+	$(JAVA) -cp $(BUILD_DIR) $(MAIN_CLASS)
+
+# Clean compiled classes
+.PHONY: clean
+clean:
+	rm -rf $(BUILD_DIR)/*
+	@echo "Clean completed!"
+
+# Rebuild the project
+.PHONY: rebuild
+rebuild: clean compile
+
+# Help target
+.PHONY: help
+help:
+	@echo "Available targets:"
+	@echo "  all      - Compile all source files (default)"
+	@echo "  compile  - Compile all source files"
+	@echo "  run      - Compile and run the application"
+	@echo "  clean    - Remove all compiled classes"
+	@echo "  rebuild  - Clean and compile all source files"
+	@echo "  help     - Display this help message"

JavaDemo/multiclass-demo/src/com/example/Application.java

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+package com.example;
+
+public class Application {
+    public static void main(String[] args) {
+        // 创建PersonService实例
+        PersonService service = new PersonService();
+        
+        // 添加一些Person对象，注意名字的大小写会被自动规范化
+        service.addPerson(new Person("alice", 25));
+        service.addPerson(new Person("BOB", 30));
+        service.addPerson(new Person("cHaRlIe", 35));
+        
+        // 显示所有人员
+        System.out.println("All persons (with names properly capitalized):");
+        for (Person person : service.getAllPersons()) {
+            System.out.println(person);
+        }
+        
+        // 查找特定人员
+        Person found = service.findPersonByName("Bob");
+        System.out.println("\nFound person: " + found);
+        
+        // 测试修改人员名字
+        if (found != null) {
+            found.setName("david");
+            System.out.println("After name change: " + found);
+        }
+    }
+}

JavaDemo/multiclass-demo/src/com/example/Person.java

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+package com.example;
+
+import com.example.util.StringUtils;
+
+public class Person {
+    private String name;
+    private int age;
+    
+    public Person(String name, int age) {
+        // 使用工具类方法
+        this.name = StringUtils.capitalize(name);
+        this.age = age;
+    }
+    
+    public String getName() {
+        return name;
+    }
+    
+    public int getAge() {
+        return age;
+    }
+    
+    public void setName(String name) {
+        this.name = StringUtils.capitalize(name);
+    }
+    
+    public void setAge(int age) {
+        this.age = age;
+    }
+    
+    @Override
+    public String toString() {
+        return "Person{name='" + name + "', age=" + age + "}";
+    }
+}

JavaDemo/multiclass-demo/src/com/example/PersonService.java

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+package com.example;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class PersonService {
+    private List<Person> persons;
+    
+    public PersonService() {
+        this.persons = new ArrayList<>();
+    }
+    
+    public void addPerson(Person person) {
+        persons.add(person);
+    }
+    
+    public List<Person> getAllPersons() {
+        return new ArrayList<>(persons);
+    }
+    
+    public Person findPersonByName(String name) {
+        return persons.stream()
+                .filter(p -> p.getName().equals(name))
+                .findFirst()
+                .orElse(null);
+    }
+}

JavaDemo/multiclass-demo/src/com/example/util/StringUtils.java

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+package com.example.util;
+
+public class StringUtils {
+    public static boolean isEmpty(String str) {
+        return str == null || str.length() == 0;
+    }
+    
+    public static String capitalize(String str) {
+        if (isEmpty(str)) {
+            return str;
+        }
+        return str.substring(0, 1).toUpperCase() + str.substring(1).toLowerCase();
+    }
+}