?? melon_ex.java
字號:
class Melon
{float weight;
static float total_weight=0;
static int total_number=0;
public Melon(float w)
{weight=w;
total_weight=total_weight+weight;
total_number=total_number+1;
}
public void reduce()
{total_weight=total_weight-weight;
total_number=total_number-1;
}
}
public class Melon_ex
{public static void main(String args[])
{Melon m1,m2;
m1=new Melon(10);
m2=new Melon(12);
System.out.println("Total weight: "+m1.total_weight);
System.out.println("Total number: "+Melon.total_number);
m1.reduce();
System.out.println("Total weight: "+Melon.total_weight);
System.out.println("Total number: "+Melon.total_number);
m2.reduce();
System.out.println("Total weight: "+Melon.total_weight);
System.out.println("Total number: "+Melon.total_number);
}
}
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