session 7 solution

session7/build.gradle

+plugins {
+	id 'org.springframework.boot' version '2.5.5'
+	id 'io.spring.dependency-management' version '1.0.11.RELEASE'
+	id 'java'
+}
+
+group = 'com.crio'
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = '8'
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+
+	// https://mvnrepository.com/artifact/com.opencsv/opencsv
+// --> Activity 2
+implementation("com.opencsv:opencsv:5.4")
+// --<
+// https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api
+testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
+// https://mvnrepository.com/artifact/org.mockito/mockito-junit-jupiter
+testImplementation 'org.mockito:mockito-junit-jupiter:3.10.0'
+
+
+}
+
+test {
+	useJUnitPlatform()
+}

session7/gradle/wrapper/gradle-wrapper.properties

+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

session7/gradlew

+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

session7/gradlew.bat

+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

session7/settings.gradle

+rootProject.name = 'session7'

session7/src/main/java/com/crio/session7/activity1/A.java

+package com.crio.session7.activity1;
+
+public class A {
+    public void print(){
+        System.out.println("Class A");
+    }
+}

session7/src/main/java/com/crio/session7/activity1/B.java

+package com.crio.session7.activity1;
+
+public class B extends A{
+    @Override
+    public void print(){
+        System.out.println("Class B");
+    }
+}

session7/src/main/java/com/crio/session7/activity1/Main.java

+package com.crio.session7.activity1;
+
+public class Main {
+    public static void main(String args[])    
+    {   
+        B data = new B();   
+        data.print();        
+    }   
+}

session7/src/main/java/com/crio/session7/activity2/Main.java

+package com.crio.session7.activity2;
+
+public class Main {
+    public static void main(String args[])    
+    {   
+        try{
+            Class.forName("com.opencsv.CSVParser");
+        }catch(Exception e){
+            e.printStackTrace();
+        }
+    }   
+}

session7/src/main/java/com/crio/session7/activity3/Main.java

+package com.crio.session7.activity3;
+
+public class Main {
+    public static void main(String args[])    
+    {
+        String name = null;
+        try{
+            if ("Crio.Do".equals(name)){
+                System.out.println("Match Found!");
+            }
+            else{
+                System.out.println("No Match Found!");
+            }
+        }catch(Exception e){
+            e.printStackTrace();
+        }
+    }   
+}

session7/src/main/java/com/crio/session7/activity4/Main.java

+package com.crio.session7.activity4;
+
+import java.io.FileNotFoundException;
+
+public class Main {
+    public static void main(String[] args) throws FileNotFoundException {
+        method1();
+        System.out.println("After Calling method1()");
+    }
+    public static void method1() throws FileNotFoundException{
+        method2();
+    }
+    public static void method2() throws FileNotFoundException{
+        method3();
+    }
+
+    public static void method3() throws FileNotFoundException{
+        throw new FileNotFoundException();
+    }
+}

session7/src/main/java/com/crio/session7/activity5/Bank.java

+package com.crio.session7.activity5;
+
+public interface Bank {
+    public void deposite(double amount) throws InvalidAmountException;
+    public double withdraw(double amount) throws InsufficientFundsException;
+    public void balanceEnquiry();
+}

session7/src/main/java/com/crio/session7/activity5/ICICIBank.java

+package com.crio.session7.activity5;
+
+public class ICICIBank implements Bank{
+    private double balance;
+ public void deposite(double amount) throws InvalidAmountException 
+ {
+  if(amount <= 0)
+  {
+   throw new InvalidAmountException(amount + "is not valid");
+  }
+  balance = balance + amount;
+ }
+ public double withdraw(double amount) throws InsufficientFundsException 
+ {
+  if(balance < amount)
+  {
+   throw new InsufficientFundsException("insufficient funds");
+  }
+  balance = balance - amount;
+  return amount;
+ }
+ public void balanceEnquiry() 
+ {
+  System.out.println("current balance = "+ balance);
+ }
+}

session7/src/main/java/com/crio/session7/activity5/InsufficientFundsException.java

+package com.crio.session7.activity5;
+
+public class InsufficientFundsException extends Exception 
+{
+ public InsufficientFundsException()
+ {
+  super();
+ }
+ public InsufficientFundsException(String msg)
+ {
+  super(msg);
+ }
+}
\ No newline at end of file

session7/src/main/java/com/crio/session7/activity5/InvalidAmountException.java

+package com.crio.session7.activity5;
+
+public class InvalidAmountException extends Exception
+{
+ public InvalidAmountException()
+ {
+  super();
+ }
+ public InvalidAmountException(String msg)
+ {
+  super(msg);
+ }
+}
\ No newline at end of file

session7/src/main/java/com/crio/session7/activity5/Main.java

+package com.crio.session7.activity5;
+
+import java.util.Scanner;
+
+public class Main {
+    public static void main(String[] args) {
+      try
+      {
+        Scanner sc = new Scanner(System.in);
+        Bank acc1 = new ICICIBank();
+        String option = "";
+        do
+        {
+         System.out.println("1. DEPOSITE");
+         System.out.println("2. WITHDRAW");
+         System.out.println("3. BALANCE ENQUIRY");
+         System.out.println("ENTER OPTION");
+         option = sc.next();
+         switch(option)
+         {
+          case "1":
+          {
+           System.out.println("ENTER DEPOSIT AMOUNT");
+           double amt = sc.nextDouble();
+           acc1.deposite(amt);
+           acc1.balanceEnquiry();
+           break;
+          }
+          case "2":
+          {
+           System.out.println("ENTER WITHDRAW AMOUNT");
+           double amt = sc.nextDouble();
+           double wd = acc1.withdraw(amt);
+         System.out.println("WITHDRAW AMOUNT IS :" + wd);
+           acc1.balanceEnquiry();
+           break;
+          }
+          case"3":
+          {
+           acc1.balanceEnquiry();
+           break;
+          }
+          default:
+           System.out.println("INVALID OPTION");
+         }
+         System.out.println("DO YOU WANT TO CONTINUE (YES/NO)");
+         option = sc.next();
+        }while(option.equalsIgnoreCase("YES"));
+        sc.close();
+    }
+  catch(InvalidAmountException iae)
+  {
+   System.out.println(iae.getMessage());
+  }
+  catch(InsufficientFundsException ife)
+  {
+   System.out.println(ife.getMessage());
+  }
+  catch(NumberFormatException nfe)
+  {
+   System.out.println(nfe.getMessage());
+  }
+  
+}
+}

session7/src/main/resources/application.properties

+