类继承构造方法super()调用可以吃吗

package Day09; class SuperClass{ int x; SuperClass( ) { x=3; System.out.println("in SuperClass : x=" +x); } void doSomething( ) { System.out.println("in SuperClass.doSomething()"); } } class SubClass extends SuperClass { int x; SubClass( ) { super( );//调用父类的构造方法 x=5;//super( ) 要放在方法中的第一句 System.out.println("in SubClass :x="+x); } void doSomething( ) { super.doSomething( ); //调用父类的方法 System.out.println("in SubClass.doSomething()"); System.out.println("super.x="+super.x+" sub.x="+x); } } public class Inheritance { public static void main(String args[]){ SubClass subC=new SubClass(); subC.doSomething(); } } *********************************************************************************** 结果：in SuperClass : x=3 in SubClass :x=5 in SuperClass.doSomething() in SubClass.doSomething() super.x=3 sub.x=5