作业题

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package juxing;

public class juxing {

double chang;
  double kuan;

juxing() { chang=1; kuan=2; } 

void mianji() { System.out.println("矩形面积="+chang*kuan); } } 

public static void main(String[] args) { 
juxing myju=new juxing(); 

myju.mianji(); 
} 
}

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