题目：
从Detergent中继承产生一个新的类。覆盖scrub() 并添加一个名为sterilize() 的新方法。
解答：
先把Detergent类库代码放出来：
class Cleanser {
private String s = "Cleanser";
public void append(String a) {
s += a;
}
public void dilute() {
append(" dilute() ");
}
public void apply() {
append (" apply() ");
}
public void scrub() {
append( "scrub() ");
}
public String toString() {
return s;
}
public static void main(String[] args) {
Cleanser x = new Cleanser();
x.dilute(); x.apply(); x.scrub();
System.out.println(x);
}
}
public class Detergent extends Cleanser {
public void scrub() {
append(" Detergent.scrub() ");
super.scrub();
}
public void foam() {
append(" foam() ");
}
public static void main(String[] args) {
Detergent x = new Detergent();
x.dilute();
x.apply();
x.scrub();
x.foam();
System.out.println(x);
System.out.println(“Testing base class: ”）；
Cleanser.main(args);
}
}
根据上面的代码，来完成题目给的要求
package seven.Two;
class Cleanser {
private String s = "Cleanser";
public void append(String a) {
s += a;
}
public void dilute() {
append(" dilute() ");
}
public void apply() {
append (" apply() ");
}
public void scrub() {
append( "scrub() ");
}
public String toString() {
return s;
}
public static void main(String[] args) {
Cleanser x = new Cleanser();
x.dilute(); x.apply(); x.scrub();
System.out.println(x);
}
}
class Detergent extends Cleanser {
public void scrub() {
append(" Detergent.scrub() ");
super.scrub();
}
public void foam() {
append(" foam() ");
}
}
class NewDetergent extends Detergent {
public void scrub() {
append(" NewDetergent.scrub() ");
super.scrub();
}
public void sterilize() {
append(" sterilize() ");
}
}
public class exerciseTwo{
public static void main(String[] args) {
NewDetergent nd = new NewDetergent();
nd.apply();
nd.dilute();
nd.scrub();
nd.foam();
nd.sterilize();
System.out.println(nd);
}
}
结果如下：
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