JAVA 超类和子类均有main方法 超类和子类调换位置后运行结果不一样
class Cleanser {
private String s = new String("Cleanser");
public void append(String a) { s += a; }
public void dilute() { append(" dilute()"); }
public void apply() { append(" apply()"); }
public void scrub() { append(" scrub()"); }
public void print() { System.out.println(s); }
public static void main(String[] args) {
Cleanser x = new Cleanser();
x.dilute(); x.apply(); x.scrub();
x.print();
}
}
public class Detergent extends Cleanser {
// Change a method:
public void scrub() {
append(" Detergent.scrub()");
super.scrub(); // Call base-class version
}
// Add methods to the interface:
public void foam() { append(" foam()"); }
// Test the new class:
public static void main(String[] args) {
Detergent x = new Detergent();
x.dilute();
x.apply();
x.scrub();
x.foam();
x.print();
System.out.println("Testing base class:");
Cleanser.main(args);
}
} ///:
将子类放在超类前面运行结果如
Cleanser dilute() apply() scrub()
将超类放在子类前面 运行结果如下
Cleanser dilute() apply() Detergent.scrub() scrub() foam()
Testing base class:
Cleanser dilute() apply() scrub()
[解决办法]
看你运行的是哪个类
java Detergent
还是
java Cleanser
如果是在eclipse中，可以选择run - run configuration-然后选择一个类
