三种不同创建示例的方式 var people = new People(); var people = People(); var people = const People();
2.2 类的定义
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class People { String name; //默认 null um age; // 默认 null } 创建类示例 var people = new People(); people.name = "zhangsan"; people.age = 12; 在类中定义的非final属性,默认生成set,get方法。比如people.name相当于people.setName("zhangsan"); people.name 相当于 people.getName();
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