Error: Missing return statement in Java

fuction must have all possibilities to return a value. think like if for loop does't execute in some conditon then what happen?. so you have give return value for all possibilities

public boolean ifInArray(String name)
{
    for ( Dog breed: breeds) {
        if (breed.equals(name)) {
            return true;
        } else {
            return false;
        }
    }
    return false;
}

You are only looking at the first entry in the array 'breeds' and immediately returning a true/false value. You need to iterate over every element and only return true if you find a match. Otherwise, return false.

public boolean ifInArray(String name)
{
    for ( Dog breed: breeds) {
        if (breed.equals(name))
            return true;
    }
    return false;
}

Remove the else block and place a return false after the loop ends. If it finds a value, it will return true from inside the loop. If it finds nothing, it will return false after the loop finishes.

Your current implementation will return false if the first breed does not match, rather than checking against all breeds.

You can store the boolean in a variable and just return the variable.

public boolean ifInArray(String name)
{
    Boolean result = null;
    for ( Dog breed: breeds ) {
        if (breed.equals(name)) {
            result = true;
        } else {
            result = false;
        }
    }

    return result;
}

your have returns inside if, so its not accessible to the method directly. there has to be a default if, especially since you have if inside for loop. Consider the case where the string comes as empty, the method will have nothing to return.

write your method as this:

public boolean ifInArray(String name)
{
for ( Dog breed: breeds) {
    if (breed.equals(name)) {
        return true;
    } else {
        return false;
    }
}
return false;
}