diff --git a/labs/lab4/Account.class b/labs/lab4/Account.class
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diff --git a/labs/lab4/Account.java b/labs/lab4/Account.java
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+//******************************************************* 
+// Account.java 
+// 
+// A bank account class with methods to deposit to, withdraw from, 
+// change the name on, charge a fee to, and print a summary of the account. 
+//******************************************************* 
+public class Account 
+{ 
+ private double balance; 
+ private String name; 
+ private long acctNum; 
+ //---------------------------------------------- 
+ //Constructor -- initializes balance, owner, and account number 
+ //---------------------------------------------- 
+ public Account(double initBal, String owner, long number) 
+ { 
+ balance = initBal; 
+ name = owner; 
+ acctNum = number; 
+ } 
+ //---------------------------------------------- 
+ // Checks to see if balance is sufficient for withdrawal. 
+ // If so, decrements balance by amount; if not, prints message. 
+ //---------------------------------------------- 
+ public void withdraw(double amount) 
+ { 
+ if (balance >= amount) 
+ balance -= amount; 
+ else 
+ System.out.println("Insufficient funds"); 
+ } 
+ //---------------------------------------------- 
+ // Adds deposit amount to balance. 
+//3
+//Chapter 4: Writing Classes
+ //---------------------------------------------- 
+ public void deposit(double amount) 
+ { 
+ balance += amount; 
+ } 
+ //---------------------------------------------- 
+ // Returns balance. 
+ //---------------------------------------------- 
+ public double getBalance() 
+ { 
+ return balance; 
+ } 
+ //---------------------------------------------- 
+ // Returns a string containing the name, account number, and balance. 
+ //---------------------------------------------- 
+ public String toString() 
+ { 
+    String strbalance = balance+"";
+    return "Account name: " + name + ", Account num: " + acctNum + ", Account balance: " + strbalance;
+ } 
+ //---------------------------------------------- 
+ // Deducts $10 service fee 
+ //---------------------------------------------- 
+ public void chargeFee() 
+ { 
+    balance -= 10;
+ } 
+ //---------------------------------------------- 
+ // Changes the name on the account 
+ //---------------------------------------------- 
+ public void changeName(String newName) 
+ 
+ { 
+    name = newName;
+ } 
+} 
diff --git a/labs/lab4/Grades.java b/labs/lab4/Grades.java
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+// **************************************************************** 
+// Grades.java 
+// 
+// Use Student class to get test grades for two students 
+// and compute averages 
+// 
+// **************************************************************** 
+public class Grades 
+{ 
+ public static void main(String[] args) 
+ { 
+ Student student1 = new Student("Mary"); 
+ //create student2, "Mike"
+ Student student2 = new Student("Mike"); 
+ //input grades for Mary 
+ student1.inputGrades();
+ //print average for Mary 
+ System.out.println(student1.getAverage()); 
+ //input grades for Mike
+ student2.inputGrades(); 
+ //print average for Mike
+ System.out.println(student2.getAverage()); 
+ } 
+}
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diff --git a/labs/lab4/ManageAccounts.java b/labs/lab4/ManageAccounts.java
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+// **************************************************************** 
+// ManageAccounts.java 
+// 
+// Use Account class to create and manage Sally and Joe's 
+// bank accounts 
+// ****************************************************************
+public class ManageAccounts 
+{ 
+ public static void main(String[] args) 
+ { 
+ Account acct1, acct2; 
+ //create account1 for Sally with $1000 
+ acct1 = new Account(1000, "Sally", 1111); 
+ //create account2 for Joe with $500 
+ acct2 = new Account(500, "Joe", 2222);
+ //deposit $100 to Joe's account
+ acct2.deposit(100); 
+ //print Joe's new balance (use getBalance())
+ acct2.getBalance(); 
+ //withdraw $50 from Sally's account 
+ acct1.withdraw(50);
+ //print Sally's new balance (use getBalance())
+ acct1.getBalance(); 
+ //charge fees to both accounts
+ acct1.chargeFee();
+ acct2.chargeFee(); 
+ //change the name on Joe's account to Joseph
+ acct2.changeName("Joseph"); 
+ //print summary for both accounts
+ System.out.println(acct1);
+ System.out.println(acct2); 
+ } 
+} 
diff --git a/labs/lab4/Student.class b/labs/lab4/Student.class
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diff --git a/labs/lab4/Student.java b/labs/lab4/Student.java
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+// **************************************************************** 
+// Student.java 
+// 
+// Define a student class that stores name, score on test 1, and 
+// score on test 2. Methods prompt for and read in grades, 
+// compute the average, and return a string containing student’s info. 
+// **************************************************************** 
+import java.util.Scanner; 
+public class Student 
+{ 
+ private String studentName;
+ private double test1;
+ private double test2;
+ public Student(String studentName) 
+ { 
+ this.studentName = studentName;
+ this.test1 = 0;
+ this.test2 = 0;
+ } 
+ //----------------------------------------------- 
+ //inputGrades: prompt for and read in student's grades for test1 and test2. 
+ //Use name in prompts, e.g., "Enter's Joe's score for test1". 
+ //----------------------------------------------- 
+ public void inputGrades() 
+ { 
+ System.out.println("Enter "+studentName+"'s score for test1");
+ Scanner scan = new Scanner(System.in);
+ test1 = scan.nextDouble();
+ System.out.println("Enter "+studentName+"'s score for test2");
+ test2 = scan.nextDouble();
+ } 
+ //----------------------------------------------- 
+ //getAverage: compute and return the student's test average 
+ //----------------------------------------------- 
+ public double getAverage() 
+ { 
+ return (test1+test2)/2; 
+ } 
+ //----------------------------------------------- 
+ //getName: print the student's name 
+ //----------------------------------------------- 
+ public String getName() 
+ { 
+ return studentName;
+ } 
+}
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