練習問題

Question11-ConstructorAndStatic/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21"/>
+	<classpathentry kind="src" path="src/main/java"/>
+	<classpathentry kind="output" path="build/classes"/>
+</classpath>

Question11-ConstructorAndStatic/.gitignore

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+/build/

Question11-ConstructorAndStatic/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question11-ConstructorAndStatic</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.wst.common.project.facet.core.builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

Question11-ConstructorAndStatic/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=21
+org.eclipse.jdt.core.compiler.compliance=21
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=21

Question11-ConstructorAndStatic/.settings/org.eclipse.wst.common.project.facet.core.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<faceted-project>
+  <installed facet="java" version="21"/>
+</faceted-project>

Question11-ConstructorAndStatic/src/main/java/Atm.java

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+
+public class Atm {
+	int credit;
+
+
+	public Atm(){
+		this.credit = 100000;
+	}
+	public void withdraw(Wallet wallet,int money) {
+		if(this.credit < money) {
+			System.out.println("預金残高不足です。現金の引き出しに失敗しました。");
+		}
+		else {
+			 credit = credit - money;
+			 wallet.money = wallet.money + money;
+			 System.out.println("ATMの残り残高は" + credit + "です");
+		}
+	}
+}

Question11-ConstructorAndStatic/src/main/java/Cat.java

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+
+public class Cat {
+	String name;
+	
+	public Cat(String name){
+		this.name = name;
+		
+		
+	}
+	
+	public Cat() {
+        this.name = "ミケ";
+	}
+}

Question11-ConstructorAndStatic/src/main/java/Q11_1.java

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+
+public class Q11_1 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		Wallet wallet = new Wallet();
+		
+		wallet.money = 10000;
+		
+		User user = new User();
+		
+		user.name = "太郎";
+		
+		
+		user.wallet = wallet;
+		
+		user.confirmWallet();
+		
+		user.useMoney(1000);
+		
+		user.confirmWallet();
+		
+	}
+	
+	
+
+}

Question11-ConstructorAndStatic/src/main/java/Q11_2.java

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+
+public class Q11_2 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+        Wallet wallet = new Wallet();
+        
+        wallet.money = 10000;
+        
+        Atm atm = new Atm();
+        
+        atm.withdraw(wallet, 100000);
+        
+        System.out.println("ATMの残り残高" + wallet.money + "円です");
+        
+        atm.withdraw(wallet, 100000);
+        
+        System.out.println("財布の中の残額は" + wallet.money + "円です");
+        
+	}
+
+}

Question11-ConstructorAndStatic/src/main/java/Q11_3.java

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+
+public class Q11_3 {
+
+	public static void main(String[] args) {
+		Cat cat1 = new Cat("タマ");
+		System.out.println(cat1.name);
+		
+		Cat cat2 = new Cat();
+		System.out.println(cat2.name);
+		
+	}
+
+}

Question11-ConstructorAndStatic/src/main/java/Q11_4.java

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+
+public class Q11_4 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		
+		Student student = new Student();
+		student.name = "太郎";
+		Student.group = "A";
+		Student.teacher = "山田";
+		
+		student.studentProfile();
+		
+		Student.groupProfile();
+		
+	}
+
+}

Question11-ConstructorAndStatic/src/main/java/Student.java

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+
+public class Student {
+	String name;
+	static String group;
+    static String teacher;
+    
+    public void studentProfile() {
+        System.out.println(name + "は" + group + "教室の生徒です。");
+    }
+    
+    public static void groupProfile() {
+        System.out.println(group + "教室の担任は" + teacher + "先生です。");
+    }
+}

Question11-ConstructorAndStatic/src/main/java/User.java

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+
+public class User {
+	String name;
+	Wallet wallet;
+
+	public void useMoney(int money) {
+		
+	wallet.money = wallet.money - money;
+	
+	System.out.println(name + "は財布の中のお金を" + money + "円使用しました");
+    }
+	
+	public void confirmWallet() {
+	System.out.println(name + "の財布の中の残額は" + wallet.money + "円です");
+	}
+	
+}

Question11-ConstructorAndStatic/src/main/java/Wallet.java

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+
+public class Wallet {
+	int money;
+	
+}