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public class Constructor1 { private String str = "nihao"; private String str1 = null; private String str2 = str1; Constructor1(String s){ this.str1 = s; } public static void main(String[] args) { Constructor1 c = ne

public class Constructor1 { private String s; public static void main(String[] args) { Constructor1 c = new Constructor1(); System.out.print(c.s); } } 输出结果：