多选题

以下那些代码段能正确执行

Question

A. public static void main(String args[]) {
byte a = 3
byte b = 2
b = a + b
System.out.println(b)
}

B. public static void main(String args[]) {
byte a = 127
byte b = 126
b = a + b
System.out.println(b)
}

C. public static void main(String args[]) {
byte a = 3
byte b = 2
a+=b
System.out.println(b)
}

D. public static void main(String args[]) {
byte a = 127
byte b = 127
a+=b
System.out.println(b)
}