How to check If a multiline String contains another multiline String in Java?

Question

1.I tried to use the contains function BUT it did not work, it only works when b = "30-10-1960\n" or b = "Posephine Esmerelda Bloggs\n". How to check if a contains b? 2.Here is the code I wrote.

String a = "name Posephine Esmerelda Bloggs\n" + 
        "birthday 30-10-1960\n" + 
        "address 102 Smith St, Summer hill, NSW 2130\n" + 
        "";
String b = "Posephine Esmerelda Bloggs\n" + 
        "30-10-1960\n";
System.out.println("a.contains(b)");

Answer 1

I think the logic you want here is to assert that every line of the b string appears somewhere in the a string:

String a = "name Posephine Esmerelda Bloggs\n" + 
    "birthday 30-10-1960\n" + 
    "address 102 Smith St, Summer hill, NSW 2130\n" + 
    "";
String b = "Posephine Esmerelda Bloggs\n" + 
    "30-10-1960\n";
String[] lines = b.split("\n");

// now check each line
boolean all = true;
for (String line : lines) {
    if (!a.contains(line)) {
        all = false;
        break;
    }
}

if (all) {
    System.out.println("MATCH");
}
else {
    System.out.println("NO MATCH");
}

This prints:

MATCH