corejava.day10_8(jdk5.0泛型之通配符与泛型方法)（Corejava.day10_8 (jdk5.0 generic wildcards and generic methods)）.docVIP

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corejava.day10_8(jdk5.0泛型之通配符与泛型方法)（Corejava.day10_8 (jdk5.0 generic wildcards and generic methods)）.doc

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corejava.day10_8(jdk5.0泛型之通配符与泛型方法)（Corejava.day10_8 (jdk5.0 generic wildcards and generic methods)）

corejava.day10_8(jdk5.0泛型之通配符与泛型方法)（Corejava.day10_8 (jdk5.0 generic wildcards and generic methods)） Last class, we talked about whats going on in JDK5.0. Lets add it to this class. JDK5.0 is an epoch-making version, making great changes and breakthroughs over the previous version of JDK, including a generic version. Of course, in the first place, generics are primarily focused on the collection, and on the collection of type safety implemented in generics. This class begins with a thorough introduction of some of the more advanced generic content. Generics are used for compile time syntax, and syntax for compile time is also mentioned, such as 5 automatic closures. For example, 5 Li can write Integer, I = 14; this sentence is correct in 5, and in the previous 1.4, it was wrong. Why is it right? Because when the compiler compiles the program, it changes the sentence to this sentence, Integer I = new Integer (14); we have said before that, and the compiler can help you translate. Wait until the virtual machine is running, the operation is behind this sentence, so for the virtual machine will not mix int and Integer, the virtual machine is very clear, this is called compile time syntax. Generics are the same. Generic information is erased at run time. As weve said before, you probably dont have a particular mind. We say that generics are not polymorphic. What generic is the object, and the reference must be generic. The generic on both sides of the sign must be consistent. (as before, write a TestGenerics3 class, the main function, the import ListString L statement) it must be equal to a generic String List, ListString L = new (ArrayListString); the front is String, is also behind the String, or wrong, such as you write ListObject L = new ArrayListString (front); is Object, is behind the String, Object not String the parent class? I use polymorphism, OK, you see if theres a red line, which means generics cant be polymorphic. Why? This is polymorphic, and generics dont