public class duixiang {
/*int a;
duixiang()//类的构造方法//名字与类名字相同
{
}
void output()//构造函数
{
int sum=0;int a=2;
System.out.println(sum);
while(a<=100) {="" sum+="a;" a++;="" }="" system.out.println(sum);="" }="" public="" static="" void="" main(string[]="" args)="" {="" duixiang="" text;//创建一个类中的实例;="" text="new" duixiang();//不能直接调用构造函数,必须创建一个实例,然后用new来对新的实例进行调用="" text.output();*/="" float="" x;="" float="" i;="" duixiang(float="" f){="" float="" x="f;" }="" float="" output()="" {="" return="" 3.14f*x*x;="" }="" public="" static="" void="" main(string[]="" args){="" duixiang="" y="new" duixiang(4.5f);="" duixiang="" z="new" duixiang(6.7f);="" system.out.println("y="+y.output());
System.out.println(" z="+z.output());
}
}
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