1102自主学習

Question17-StackTrace/.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>

Question17-StackTrace/.gitignore

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+/build/

Question17-StackTrace/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question17-StackTrace</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>

Question17-StackTrace/.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

Question17-StackTrace/.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>

Question17-StackTrace/src/main/java/Product.java

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+
+public class Product {
+	private String name;
+	private int price;
+	
+	public Product(String name, int price) {
+		this.name = name;
+		this.price = price;
+	}
+	
+	public String getName() {
+		return name;
+	}
+	
+	public int getPrice() {
+		return price;
+	}
+}

Question17-StackTrace/src/main/java/Question17_1.java

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+
+public class Question17_1 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		int[] nums1 = {80, 90, 70};
+		int[] nums2 = {};
+		scoreexception(nums1);
+		scoreexception(nums2);
+	}
+	
+	//例外処理
+	public static void scoreexception(int[]nums) {
+		try {
+			report(nums);
+		}catch(ArithmeticException e) {
+		System.out.println("採点データがないため、平均点を計算できませんでした");
+		}
+	}
+	
+	//平均点レポート処理（最上位）
+	public static void report(int[]nums) {
+		int score = average(nums);
+		System.out.println("平均点は" + score + "点です");
+	}
+	
+	//平均点算出処理（中間）
+	public static int average(int[]nums) {
+		int total = 0;
+		for(int i = 0; i < nums.length; i++) {
+			total += nums[i];
+		}
+		int result = divide(total, nums.length);
+		return result;
+	}
+	
+	//割り算処理（最下位）
+	public static int divide(int num1, int num2) {
+		return num1/num2;
+	}
+
+}

Question17-StackTrace/src/main/java/Question17_2.java

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+
+public class Question17_2 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		Product product1 = new Product("りんご", 150);
+		Product product2 = new Product("みかん", 100);
+		Product[]product = new Product[2];
+		product[0] = product1;
+		product[1] = product2;
+		
+		searchResult(product, "りんご");
+		searchResult(product, "バナナ");
+	}
+
+	
+	//商品検索処理
+	public static Product search(Product[]product, String targetName) {
+		for(int i = 0; i < product.length; i++) {
+			if(product[i].getName().equals(targetName)) {
+				return product[i];
+			}
+		}
+		return null;
+	}
+	
+	//検索結果表示処理
+	public static void searchResult(Product[]product, String targetName) {
+		Product result = search(product, targetName);
+		if(result == null) {
+			System.out.println(targetName + "は見つかりませんでした");
+		}else {
+		result.getPrice();
+		System.out.println(targetName + "の価格は" + result.getPrice() + "円です");
+		}
+	}
+}

Question17-StackTrace/src/main/java/Question17_3.java

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+
+public class Question17_3 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		register("花子", 20);
+		register("", 20);
+		register("太郎", -5);
+	}
+
+	//会員登録処理（最上位）
+	public static void register(String name, int age) {
+		try{
+			ageCheck(name, age);
+			System.out.println(name + "を登録しました");
+	}catch(IllegalArgumentException e) {
+		System.out.println("年齢は0以上を入力してください");
+	}catch(NullPointerException e) {
+		System.out.println("名前を入力してください");
+	}
+		
+		
+	}
+	
+	//入力チェック処理（中間）
+	public static void ageCheck(String name, int age) {
+		nameCheck(name);
+		if(age < 0) {
+			throw new IllegalArgumentException();
+		}
+	}
+	
+	//名前チェック処理（最下位）
+	public static void nameCheck(String name) {
+		if(name == null || name.isEmpty()) {
+			throw new NullPointerException();
+		}
+	}
+}