Java中的抽象方法和类
是。我们可以很容易地用Java创建抽象方法/类。
示例
要创建抽象类，只需在类声明中的class关键字之前使用abstract关键字。
/* File name : Employee.java */
public abstract class Employee {
private String name; private String address;
private int number; public Employee(String name, String address, int number) {
System.out.println("Constructing an Employee");
this.name = name;
this.address = address; this.number = number;
}
public double computePay() {
System.out.println("Inside Employee computePay");
return 0.0;
}
public void mailCheck() {
System.out.println("Mailing a check to " + this.name + " " + this.address);
}
public String toString() {
return name + " " + address + " " + number;
}
public String getName() {
return name;
}
public String getAddress() {
return address;
}
public void setAddress(String newAddress) {
address = newAddress;
}
public int getNumber() {
return number;
}
}您可以观察到，除抽象方法外，Employee类与Java中的普通类相同。该类现在是抽象的，但它仍然具有三个字段，七个方法和一个构造函数。