package E; import org.junit.Test; public class EDemo{// define a globe type ,they can't been saw in static method @Test public void test(){ System.out.println(testE("string test")); /* * useGlobe("String"); * * when K been defined in globe ,why can't use the sentence */ } public void useGlobe(K i){ System.out.println(i); } public static K testStatic(K k){ return k; } public T testE(T t){// is to claim a unknown type, /* * T the late T is mean return a T type, * testE(T t) is mean should been gave a T type */ System.out.println(t); return t; } }