Android Development for Beginners : Define a Method

Method 1

/**
 * Get the email account name.
 * 
 * @return the name of the account.
 */
private String getAccountName() {
    return "android@gmail.com";
    return "droid@gmail.com";
}

Method 2

/**
 * Add $4 of tip onto the current bill.
 *
 * @return the total price of the bill (including tip).
 */
private addTip(int bill) {
    return bill + 4;
}

Method 3

/**
 * Sets up the app for the current city.
 */
private nothing setup() {
    cityName = "London";
}

Method 4

/**
 * Get the number of students in a class.
 *
 * @return the number of students.
 */
private int getStudentClassSize() {
    return "20";
}

Method 1: (LN 8) can't have two return statements.
Method 2: (LN 6) return type absent.
Method 3: (LN 4) return type absent.
Method 4: (LN 7) returning type and return content is different, defined int as return type then entered text.

PS: Im answering here cause I cant answer in the classroom because of chrome issues

I dont agree. "nothing" could be the type of an object made by us.

but method is not returning anything as there is no return statement

Method 1 >> Error Line 8 return "droid@gmail.com";
The Correct
private String getAccountName() {
return "android@gmail.com";
}
Method 2 >> Error Line 6 private addTip(int bill) {
The Correct
private int addTip(int bill) {
return bill + 4;
}
Method 3 >> Error Line 4 private nothing setup() {
The Correct
private string setup() {
cityName = "London";
}
Method 4 >> Error Line 7 return "20";
The Correct
private int getStudentClassSize() {
return 20;
}