摘要： PublicPublic is the most well known of the Java keywords. Public is also the easiest of the Java access modifiers because of its nature. A variable or... 阅读全文

摘要： Java Generic's wildcards is a mechanism in Java Generics aimed at making it possible to cast a collection of a certain class, e.g A, to a collection o... 阅读全文

摘要： Java provides a number of access modifiers to set access levels for classes, variables, methods and constructors. The four access levels are:Visible t... 阅读全文