java exists in list code example

Example 1: check if a list contains a string java

String search = "A";
for(String str: myList) {
    if(str.trim().contains(search))
       return true;
}
return false;

Example 2: java check if key exists in list

if (lista.contains(conta1)) {
    System.out.println("Account found");
} else {
    System.out.println("Account not found");
}