Java类-入门

概述

1.

示例：

计算矩形面积

class area{
    float lenth;
    float weight;
    flost a(){
        float re=lenth*weight;
        return re;
    }
}
public class b{
    public static void main(String args[]){
        area first;
        first=new area();
        first.lenth=10;
        first.weight=2;
        System.out.print(first.a)
    }
}

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参考链接：