在下列源代码文件Test. java中,正确定义类的代码是( )。
A.pblic class test { public int x=0; public test(int {thi x=x;} } B.public class Test { public int x=0; public Test(int {thi x=x;} } C.public class Test extends T1,T2{ public int x = 0; public Test(int { thi x = x; }} D.protected class Test extends T2{ public int x = 0; public Test(int {thi x = x; } }