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[问答题]class Ex0707Super { public Ex0707Super(String name) { System.out.println("superclass constructor"+name); } } class Ex0707Sub extends Ex0707Super { public Ex0707Sub(String name) { System.out.println("subclass constructor"+name); } public Ex0707Sub( ) { System.out.println("subclass constructor no name"); super("no name"); } } public class Ex0707Demo { Ex0707Super superObj=new Ex0707Super("zhangsan"); Ex0707Sub subObj = new Ex0707Sub("lisi"); Ex0707Super superRef=subObj; Ex0707Sub subRef=superObj; } 上述程序存在3个错误,请指出来,并写出修改方案.

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