雨渐渐

摘要： Collection<String> A=new ArrayList<String>(); Collection<String> B=new ArrayList<String>(); A.add("A"); A.add("B"); A.add("C"); B.add("D"); B.add("B"); B.add("C"); System.out.println(A); System.out.println(B); bool.. 阅读全文

摘要： public class Name { private String firstName; private String lastName; public Name(String firstName, String lastName) { this.firstName = firstName; this.lastName = lastName; } public int hashCode(){ return this.firstName.hashCode(); } public boolean equa... 阅读全文