class Person {
int id;
String name;
public void setid(int id) {
this.id = id;
}
public String getname() {
return name;
}
}class Student extends Person {
String school;
public void setSchool(String school){
this.school = school;
}
}public class TestEx {
public static void main(String[] ages) {
Student s = new Student();
s.setid(5);
// s.getname("john");
// s.setSchool("dx");
//
System.out.println(s.setid());
// System.out.println(s.getname());
// System.out.println(s.setSchool());
}
}
错误提示:
C:\TestJava\TestEx>javac TestEx.java
TestEx.java:32: 无法将 Person 中的 setid(int) 应用于 ()
System.out.println(s.setid());看了半天也没明白是什么问题,请大侠们看一下。
你想让System.out.println输出什么?
this.id = id;
}
这个方法是用来设置id的,不是用来获取id的
class Person {
int id;
String name;
/**
* setXX()用来设置对象的属性值
* getXX()用来获取对象的属性值
*
*/
public int getId() {
return id;
} public void setId(int id) {
this.id = id;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
}}class Student extends Person {
String school; public void setSchool(String school) {
this.school = school;
} public String getSchool() {
return school;
}}public class TestEx {
public static void main(String[] ages) { Student s = new Student(); s.setId(5);
s.setName("john");
s.setSchool("dx"); System.out.println(s.getId());
System.out.println(s.getName());
System.out.println(s.getSchool()); }
}