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GeezerVison is showing github.com — JavaLearningPath/Generics/src/TypeInference.java at master · AlexGithubbb/JavaLearningPath

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TypeInference.java

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public class TypeInference {
public static class BoxDemo {
public static class Box<T>{
private T t;
public void set( T t){
this.t = t;
}
public T get(){
return t;
}
}
public static <T> void addBox(T t, java.util.List<Box<T>> boxes){
Box<T> box = new Box<>();
box.set(t);
boxes.add(box);
}
public static <U> void outputBoxes(java.util.List<Box<U>> boxes) {
int counter = 0;
for (Box<U> box: boxes) {
U boxContents = box.get();
System.out.println("Box #" + counter + " contains [" +
boxContents.toString() + "]");
counter++;
}
}
public static void main(String[] args) {
java.util.ArrayList<Box<Integer>> listOfIntegerBoxes =
new java.util.ArrayList<>();
BoxDemo.<Integer>addBox(10, listOfIntegerBoxes);
BoxDemo.addBox(20, listOfIntegerBoxes);
BoxDemo.addBox(30, listOfIntegerBoxes);
BoxDemo.outputBoxes(listOfIntegerBoxes);
}
}
/*Type Inference and Generic Constructors of Generic and Non-Generic Classes*/
class MyClass<X> {
<T> MyClass(T t) {
}
}
MyClass<Integer> myObject = new MyClass<>("hello");
/*
static <T> List<T> emptyList();
List<T> list = Collections.emptyList();
void processStringList(List<String> stringList) {
// process stringList
}
processStringList(Collections.emptyList()); // not work in JAVA SE 7
// has to be like this in SE 7:
processStringList(Collections.<String>emptyList());
*/
}
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