完了済

Question16-Exception/.classpath

@@ -0,0 +1,6 @@
+<?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/.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

@@ -0,0 +1,9 @@
+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

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<faceted-project>
+  <installed facet="java" version="21"/>
+</faceted-project>

Question16-Exception/build/classes/.gitignore

@@ -0,0 +1,6 @@
+/Question16_1.class
+/Question16_2.class
+/EmptyException.class
+/Question16_3.class
+/Question16_4.class
+/InvalidAgeException.class

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
+		
+		System.out.println(Divide(10,2));
+//		System.out.println(Divide(10,0));
+		try {
+			System.out.println(Divide(10,0));
+		} catch (Exception e) {
+			System.out.println("0で割ることはできません");
+			System.exit(-1);
+		}
+	}
+	
+	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
+		
+		System.out.println(x2Multiple("10"));
+		
+//		System.out.println(x2Multiple("abc"));
+		try {
+			System.out.println(x2Multiple("abc"));
+		} catch(Exception e) {
+			System.out.println("数値に変換できません");
+		}
+		
+		String test = "";
+//		System.out.println("");
+		try {
+			if (test.length()==0) {
+				throw new EmptyException("入力が空です");
+			}
+		} catch(EmptyException e) {
+			System.out.println("入力が空です");
+		}
+		
+	}
+	
+	public static int x2Multiple(String str) {
+		return 2*Integer.parseInt(str);
+	}
+	
+}
+
+class EmptyException extends Exception {
+	
+	public EmptyException(String msg) {
+		super(msg);
+	}
+	
+}
+

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 = {10,20,30};
+		getValue(nums,1);
+		getValue(nums,5);
+		
+	}
+	
+	public static void getValue(int[] nums,int index) {
+		
+		try {
+			System.out.println(nums[index]);
+		} catch(Exception 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
+		
+		age(20);
+		age(-5);
+		
+	}
+	
+	public static void age(int num) {
+		try {
+			if (num<0) {
+				throw new InvalidAgeException(num);
+			} else {
+				System.out.println("年齢は"+num+"です");
+			}
+		} catch(Exception e) {
+			
+		}
+	}
+	
+}
+
+class InvalidAgeException extends Exception {
+	public InvalidAgeException(int num) {
+		System.out.println(num+"は不正な年齢です");
+	}
+}
+