对于下列Tom类，哪个叙述是正确的
public class Test {
public static void main(String args[]){
Tom cat1 = new Tom();
Tom cat2 = new Tom(100);
}
}
class Tom {
void Tom{ System.out.print("hello"); }
Tom(int n){ System.out.print(n); }
}
public class Test {
public static void main(String args[]){
Tom cat1 = new Tom();
Tom cat2 = new Tom(100);
}
}
class Tom {
void Tom{ System.out.print("hello"); }
Tom(int n){ System.out.print(n); }
}
举一反三
- 给出下列【代码】注释标注的代码的输出结果。class Tom {int weight = 10;void Tom(){weight = 18;}}public class E {public static void main(String args[]) {Tom cat = new Tom();System.out.println(cat.weight); //【代码】}}
- 下列 A 类中【代码 1】~【代码 4】哪个是错误的? class Tom { private int x = 120; protected int y = 20; int z = 11; private void f() { x = 200; System.out.println(x); } void g() { x = 200; System.out.println(x); } } public class A { public static void main(String args[]) { Tom tom = new Tom(); tom.x = 22; //【代码 1】 tom.y = 33; //【代码 2】 tom.z = 55; //【代码 3】 tom.g(); //【代码 4】 } }
- （7-7）阅读程序，写出程序运行结果。 //写出程序运行结果 class Eye {// 猫的眼睛类 private String color; public Eye(String color) { this.color = color; } } class Cat {// 猫类 private String name; private Eye eye; public Cat(String name, Eye eye) { this.name = name; this.eye = eye; } public boolean equals(Object obj) { Cat cat = (Cat) obj; if (this.name.equals(cat.name) && this.eye == cat.eye) return true; return false; } } public class CatDemo { public static void main(String[] args) { Eye e1=new Eye("蓝色"); Cat tom1=new Cat("Tom",e1); Cat tom2=new Cat("Tom",e1); System.out.println(tom1==tom2); System.out.println(tom1.equals(tom2)); } }
- 有如下类的定义，创建Employee对象正确的是（） public class Employee{ private int age; private String name; public void Employee(){ } public Employee(int age){ this.age = age; } public Employee(String name){ this.name = name; } } A: Employee e = new Employee( ) B: Employee e = new Employee(10); C: Employee e = new Employee(tom); D: Employee e = new Employee(10,"tom");
- import java.io.*; class Person{ public void print(){System.out.print("Person ");} public void printMyGender(String s){ this.print(); System.out.print(s+" "); } } class Gender{ String type="gender"; public void print(Person p){p.printMyGender(type);} } class Female extends Gender{ public Female(){ type="female"; } } class Male extends Gender{ public Male(){ type="male"; } } class Employee extends Person{ public void print(){ System.out.print("Employee ");} } class Manager extends Employee{ public void print(){ System.out.print("Manager ");} } public class Test{ public static void main(String[] args){ Manager man = new Manager(); Employee em = new Employee(); Gender gender1 = new Male(); Gender gender2 = new Female(); gender1.print(man); gender2.print(em); } } 对于以上代码，其运行结果是