1030自主学習

Question16-Exception/.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>

Question16-Exception/.gitignore

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+/build/

Question16-Exception/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question16-Exception</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>

Question16-Exception/.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

Question16-Exception/.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>

Question16-Exception/src/main/java/Question16_1.java

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+
+public class Question16_1 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		try {
+			int result1 = divide(10, 2);
+			System.out.println(result1);
+			int result2 = divide(10, 0);
+		}catch(ArithmeticException e){
+			System.out.println("0で割ることはできません");
+		}
+	}
+	
+	public static int divide(int num1, int num2) {
+		return num1 / num2;
+	}
+
+}

Question16-Exception/src/main/java/Question16_2.java

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+
+public class Question16_2 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		ExceptionHandling("10");
+		ExceptionHandling("abc");
+		ExceptionHandling("");
+	}
+	
+	public static void ExceptionHandling(String scr) {
+		try {
+			int result = convertandtwice(scr);
+			System.out.println(result);
+		}catch(NumberFormatException e) {
+			System.out.println("数値に変換できません");
+		}catch(IllegalArgumentException e) {
+			System.out.println("入力が空です");
+		}
+	}
+	
+		public static int convertandtwice(String str) {
+			if(str.isEmpty()) {
+				throw new IllegalArgumentException();
+			}
+			int num = Integer.parseInt(str);
+			num *= 2;
+			return num;
+		}
+	
+
+}

Question16-Exception/src/main/java/Question16_3.java

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+
+public class Question16_3 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		int[] nums = new int[3];
+		nums[0] = 10;
+		nums[1] = 20;
+		nums[2] = 30;
+		
+		Check(nums, 1);
+		Check(nums, 5);
+	}
+	
+	public static int getArrayValue(int[] num1, int num2 ) {
+		return num1[num2];
+	}
+	
+	public static void Check(int[] num1, int num2 ) {
+		try {
+		int result = getArrayValue(num1, num2);
+		System.out.println(result);
+		}catch(ArrayIndexOutOfBoundsException e) {
+			System.out.println("指定した位置にデータがありません");
+		}finally{
+			System.out.println("処理を終了します");
+		}
+	}
+
+}

Question16-Exception/src/main/java/Question16_4.java

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+
+public class Question16_4 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+
+		try{
+			int num1 = ageCheck(20);
+			System.out.println("年齢は" + num1 + "です");
+			
+			int num2 = ageCheck(-5);
+			System.out.println("年齢は" + num2 + "です");
+		}catch(testException e) {
+			System.out.println(e.getMessage()+ "は不正な年齢です");
+		}
+	}
+	
+	public static int ageCheck(int num) throws testException {
+		if(num < 0) {
+			throw new testException("num");
+		}
+		return num;
+	}
+
+}

Question16-Exception/src/main/java/testException.java

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+
+public class testException extends Exception {
+	public testException(String message) {
+		super(message);
+	}
+}