Which two are equivalent？（）   

public class X {  public static void main （String[] arg...

单项选择题

public class X { 
public static void main （String[] args）  { 
byte b = 127； 
byte c = 126； 
byte d = b + c； 
} 
}  
Which statement is true？（）  

Whichisavalididentifier？（）A. falseB. defaultC. _objectD...

单项选择题Which is a valid identifier？（）  

public class Mycircle {  public double radius；  public ...

单项选择题

public class Mycircle { 
public double radius； 
public double diameter； 
public void setRadius（double radius） 
this.radius = radius； 
this.diameter= radius * 2； 
} 
public double getRadius（）   { 
return radius； 
} 
Which statement is true？（）