JAVA編程高手進，編寫壹個類，該類創建的對象可以計算等差數列之和，禁止復制粘貼，高手現編

public?class?Slum?{

public?static?void?main(String[]?args)?{

//1,3,3

//等差數列：1,2,3...?前3項求和如下：

System.out.println("Sn?=?"+a1suman(1,3,3));

System.out.println("Sn?=?"+sumnda(3,1,1));

System.out.println("Sn?=?"+sumnda2(1,3,1));

}

//知道a1,an

public?static?int?a1suman(int?a1,?int?an,?int?n){

return?(a1+an)*n/2;

}

//知道n,d,a1

public?static?int?sumnda(int?n,?int?a1,?int?d){

return?n*a1+n*(n-1)*d/2;

}

//知道n,d,a1

public?static?int?sumnda2(int?a1,?int?n,?int?d){

return?(2*a1+(n-1)*d)*n/2;

}

}

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