完了済

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

@@ -0,0 +1,25 @@
+
+public class Product {
+	
+	private String name;
+	private int price;
+	
+	public String getName() {
+		return name;
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	public int getPrice() {
+		return price;
+	}
+	public void setPrice(int price) {
+		this.price = price;
+	}
+	
+	public Product(String name,int price) {
+		this.name = name;
+		this.price = price;
+	}
+	
+}

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

@@ -0,0 +1,38 @@
+
+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
+		
+		try {
+			int[] points = {80,90,70};
+			printAverage(points);
+			int[] nullpoints = {};
+			printAverage(nullpoints);
+		} catch(Exception 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");
+			System.exit(-1);
+		}
+		
+	}
+	
+	public static void printAverage(int[] points) throws Exception {
+		System.out.println("平均点は"+getAverage(points)+"点です");
+	}
+	
+	public static double getAverage(int[] points) throws Exception {
+		if (points.length==0) {
+			throw new Exception();
+		}
+		int sum = 0;
+		for (int i=0;i<points.length;i++) {
+			sum += points[i];
+		}
+		return divide(sum,points.length);
+	}
+	
+	public static double divide(double num1, int num2) {
+		return num1/num2;
+	}
+	
+}

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

@@ -0,0 +1,37 @@
+
+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[] products = new Product[2];
+		Product product1 = new Product("りんご",150);
+		Product product2 = new Product("みかん",100);
+		products[0] = product1;
+		products[1] = product2;
+		
+		confirmStock(products,"りんご");
+		confirmStock(products,"バナナ");
+		
+	}
+	
+	public static void confirmStock(Product[] products,String name) {
+		Product product = search(products,name);
+		try {
+			System.out.println(product.getName()+"の価格は"+product.getPrice()+"です");
+		} catch(Exception err) {
+			System.out.println(name+"は見つかりませんでした");
+		}
+	}
+	
+	public static Product search(Product[] products,String name) {
+		Product product = null;
+		for (Product p:products) {
+			if(p.getName().equals(name)) {
+				product = p;
+			}
+		}
+		return product;
+	}
+
+}

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

@@ -0,0 +1,48 @@
+
+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",-1);
+		
+	}
+	
+	public static void register(String name,int age) {
+		
+		try {
+			check(name,age);
+			System.out.println(name+"を登録しました");
+		} 
+		catch (nullNameException e) {
+			System.out.println("名前を入力してください");
+		}
+		catch (invalidAgeException e) {
+			System.out.println("年齢は0以上を入力してください");
+		}
+		
+	}
+	
+	public static void check(String name,int age) throws invalidAgeException,nullNameException {
+		checkName(name);
+		if (age<0) {
+			throw new invalidAgeException();
+		}
+	}
+	
+	public static void checkName(String name) throws nullNameException {
+		if (name.length()==0) {
+			throw new nullNameException();
+		}
+	}
+	
+}
+
+class nullNameException extends Exception {
+}
+
+class invalidAgeException extends Exception {
+	
+}