下述代碼執(zhí)行后,有幾個引用變量和幾個對象?() Student stu = new Student(“Mike”); Student stua; Stua = stu;
A. 2個引用變量,1個對象 B. 1個引用變量,1個對象 C. 2個引用變量,2個對象 D. 1個引用變量,2個對象
現有: class TestFoo { int x; String y; int getX() { return x; } String getY() { return y; } void setX(int x) { int z = 7; this.x = x; } } 可以添加多少個修飾符來封裝此類?()
A. 2 B. 3 C. 4 D. 5
A. import java.sql.*; package school; class Student{ } B. package school; import java.sql.*; class Student{ } C. package school; class Student{ } import java.sql.*; D. package school; import java.sql.*;private String name; class Student{ }