class Student { private String name;
private int age;
private int number; public Student(String name, int age, int number) {
this.name = name;
this.age = age;
this.number = number;
} public void setStudent(String _name, int _age, int _number) {
name = _name;
age = _age;
number = _number;
} public void display() {
System.out.println(name + " - " + age + " - " + number);
}
}public class Stu { public static void main(String[] args) {
Student student = new Student(liu, 20, 1); student.display();
student.setStudent(chen, 20, 2);
student.display(); }
}
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - cannot find symbol
symbol: variable liu
location: class stu.Stu
at stu.Stu.main(Stu.java:37)
Java Result: 1
private int age;
private int number; public Student(String name, int age, int number) {
this.name = name;
this.age = age;
this.number = number;
} public void setStudent(String _name, int _age, int _number) {
name = _name;
age = _age;
number = _number;
} public void display() {
System.out.println(name + " - " + age + " - " + number);
}
}public class Stu { public static void main(String[] args) {
Student student = new Student(liu, 20, 1); student.display();
student.setStudent(chen, 20, 2);
student.display(); }
}
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - cannot find symbol
symbol: variable liu
location: class stu.Stu
at stu.Stu.main(Stu.java:37)
Java Result: 1
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Student student = new Student(liu, 20, 1);
liu为字符串"liu"
liu 没有定义过。
改成"liu"
Student student = new Student(liu, 20, 1); 错了 因为定义了String name,所以需要把liu需用“”才是一个字符串
public class Stu { public static void main(String[] args) {
Student student = new Student(liu, 20, 1);//liu-->"liu" student.display();
student.setStudent(chen, 20, 2); //这里也是 "chen"
student.display(); }