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资源说明：package zoology;
public class Exercises6_1 extends TT {
public Exercises6_1(String s) {
super(s);
System.out.println("How do you do?");
}
public Exercises6_1() {
this("I am Tom");
}
}
package zoology;
public class main {
public static void main(String args[]) {
Exercises6_1 t = new Exercises6_1("tom");
}
}
package zoology;
public class TT {
public TT() {
System.out.println("What a pleasure!");
}
public TT(String s) {
this();
System.out.println("I am " + s+s);
}
}
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