Comparing file content

Question

Good morning,
I am trying to determine if records in one text file are a subset of records in a second file.
For example the 1st file(A) contains the names
jan
eva
john
And the second(B) contains
eva
richard
jan
paul
I've started by formulating the problem in simple English:
"If all file A contents IN file B return TRUE
else return FALSE"
The code below compiles and runs. The problem is that it produces faulty results.
When comparing A to B, for example it returns TRUE. I'm guessing this is because the loop is exited as soon as the condition evaluates to TRUE, which leaves the file only partially read.
Comparing B to A yields FALSE as it should.
I imagine that I'll need to modify the loop so it first reads all the records in the first file and then compares them to the records in the second file.
So, my question, finally ;-), is:
can anyone give me some tips on how to adjust this code?
public boolean containsSame(String filenameb) throws IOException
     Stream a = new Stream (filename, Stream.READ);
     Stream b = new Stream (filenameb, Stream.READ);
try
     String stra;
     String strb =b.readString();
     while((stra=a.readString()) != null)
     if(stra.equals(strb))
          System.out.println("All the names in " + filename + " are found in " + filenameb);
          return true;      //Problem seems to be here
                                   // when condition = true loop appears to end
                                   // leaving (possibly) part of the file unread
catch (EOFException e)
          System.out.print("End of file");
          //System.out.println();
          System.out.println("All the names in " + filename + " are NOT found in " + filenameb);
          return false;
}

Answer 1

Call it inner and outer loops is not really good. The programming term is nested loops.
Examples:
// nested while loop
// outer loop
while (true) {
    // inner loop
    while (true) {
// nested do...while loop
// outer loop
do {
    // inner loop
    do {
    } while (true)
} while (true)
// nested for loop
// outer loop
for (int i = 0; i < length; i++) {
    // inner loop
    for (int j = 0; j <= i; j++) {
}Of course you could have any number of loops inside a loop. An you could have any combination of them.
An example:
for (int i = 0; i < length; i++) {
    while (true) {
}