Works

.gitignore

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+# C:ompiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*

Account.java

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+public class Account{
+   int id = 0;
+   double startBalance = 0;
+   double endBalance = 0;
+   double monthlyInterestRate = 0.03;
+   double interest;
+   public Account (){
+   }
+   public Account (int id, double balance, double monthlyInterestRate){
+      this.id = id;
+      this.startBalance = balance;
+      this.monthlyInterestRate = monthlyInterestRate;
+   }
+   public void computeInterest(){
+      this.interest = this.startBalance * this.monthlyInterestRate;
+      this.endBalance = this.startBalance+this.interest;
+   }
+   public void printAccountInfo(){
+      // this.computeInterest();
+      System.out.println("Account ID: " + this.id);
+      System.out.println("Account Balance: " + this.startBalance);
+      System.out.println("Interest gained: " + this.interest);
+      System.out.println("New balance: " + this.endBalance);
+   }
+}

TestAccount.java

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+public class TestAccount{
+   public static void main(String[] args){
+      Account ac1 = new Account(100,500.00,0.03);
+      Account ac2 = new Account(200,1250.00,0.03);
+      Account ac3 = new Account(300,700.00,0.02);
+      ac1.computeInterest();
+      ac1.printAccountInfo();
+      System.out.println();
+      
+      ac2.computeInterest();
+      ac2.printAccountInfo();
+      System.out.println();
+      
+      ac3.computeInterest();
+      ac3.printAccountInfo();
+      System.out.println();
+   }
+}