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classsuperClass{inty;superClass(){y=30;System.out.println("insuperClass:y="+y);}voiddoPrint(){System.out.println("InsuperClass.doPrint()");}}classsubClassextendssuperClas...
class superClass {
int y;
superClass( ) {
y=30;
System.out.println("in superClass:y="+y);
}
void doPrint(){
System.out.println("In superClass.doPrint()");
}
}
class subClass extends superClass{
int y;
subClass( ){
super(); //call constructor of superClass
y=50;
System.out.println("in subClass:y="+y);
}
void doPrint( ){
super.doPrint(); // call method of superClass
System.out.println("in subClass.doPrint()");
System.out.println("super.y="+super.y+" sub.y="+y);
}
}
public class inviteSuper{
public static void main(String args[]){
subClass subSC=new subClass();
subSC.doPrint( );
}
}
输出
in superClass:y=30
in subClass:y=50
In superClass.doPrint()
in subClass.doPrint()
super.y=30 sub.y=50
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