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lass Array{
int array[]=null;
Array(int array[]){ this.array=array;}
public int sumArray(){
int sum=0;
for(int i=0;i<array.length;i++){
sum+=array[i];
}
return sum;
}
}
public class SumArray{
public static void main(String[] args){
int array[]={1,2,3,4,5,6,7,8,9,0};
Array a=new Array(array);
System.out.println("计算数组的和:"+a.sumArray());
}
}
class Rectangle{
int c1,a1;
public void z(int width,int height){
c1=2*(width+height);
a1=width*height;
}
}
public class R2{
public static void main(String[] args){
Rectangle R=new Rectangle();
R.z(2,4);
System.out.println("矩形的周长:"+R.c1);
System.out.println("矩形的面积:"+R.a1);
}
}
class Fraction{
private int f1,f2;
Fraction(int a,int b){ f1=a;f2=b;}
public void add(Fraction c){
f1=f1*c.f2+c.f1*f2;
f2=f2*c.f2;
}
public void sub(Fraction c){
f1=f1*c.f2-c.f1*f2;
f2=f2*c.f2;
}
public void mul(Fraction c){
f1=f1*c.f1;
f2=f2*c.f2;
}
public void div(Fraction c){
f1=f1*c.f2;
f2=c.f1*f2;
}
public void print(){
System.out.println(f1+"/"+f2);
}
}
public class A5{
public static void main(String[] args){
Fraction x=new Fraction(1,2);
Fraction y=new Fraction(1,3);
x.add(y);
x.print();
x.sub(y);
x.print();
x.mul(y);
x.print();
x.div(y);
x.print();
}
}