Java 中接口的抽象方法会抛出异常吗?
java 8object oriented programmingprogramming
是的，接口的抽象方法会抛出异常。
示例
在下面的例子中，接口 (MyInterface) 包含一个名为 display 的抽象方法，该方法会抛出 IOException。
import java.io.IOException;
abstract interface MyInterface {
public abstract void display()throws IOException ;
}
要遵循的规则
在实现此类方法时，您需要遵循以下规则 −
如果接口中的抽象方法抛出某些异常。实现的方法可以抛出与下面相同的异常 −
示例 1
import java.io.IOException;
abstract interface MyInterface {
public abstract void display()throws IOException ;
}
public class InterfaceExample implements MyInterface{
public void display()throws IOException {
System.out.println("This is the subclass implementation of the display method");
}
public static void main (String args[]){
try {
new InterfaceExample().display();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
输出
This is the subclass implementation of the display method
如果接口中的抽象方法抛出某些异常。实现的方法可以选择不抛出任何异常，如下所示 −
示例 2
import java.io.IOException;
abstract interface MyInterface {
public abstract void display()throws IOException ;
}
public class InterfaceExample implements MyInterface{
public void display() {
System.out.println("This is the subclass implementation of the display method");
}
public static void main (String args[]){
try {
new InterfaceExample().display();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
输出
This is the subclass implementation of the display method
如果接口中的抽象方法抛出某个异常，实现的方法可以抛出其子类型−
示例 3
import java.io.IOException;
abstract interface MyInterface {
public abstract void display()throws Exception ;
}
public class InterfaceExample implements MyInterface{
public void display()throws IOException {
System.out.println("This is the subclass implementation of the display method");
}
public static void main (String args[]){
try {
new InterfaceExample().display();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
输出
This is the subclass implementation of the display method
如果接口中的抽象方法抛出某些异常，则实现的方法不应抛出其超类型
示例 4
import java.io.IOException;
abstract interface MyInterface {
public abstract void display()throws IOException ;
}
public class InterfaceExample implements MyInterface{
public void display()throws Exception {
System.out.println("This is the subclass implementation of the display method");
}
public static void main (String args[]){
try {
new InterfaceExample().display();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
编译时错误
输出
InterfaceExample.java:8: error: display() in InterfaceExample cannot implement display() in MyInterface
public void display()throws Exception {
^
overridden method does not throw Exception
1 error
