3. 在如下源代码文件Test.java中, 哪个是正确的类定义？
A. public class test {
public int x = 0;
public test(int x)
{
this.x = x;
}
}
B. public class Test{
public int x=0;
public Test(int x) {
this.x = x;
}
}
C. public class Test extends T1, T2 {
public int x = 0;
public Test (int x) {
this.x = x;
}
}
D. public class
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