Question

I am making a calculator same as windows calculator. I am stuck at the history feature. which would be the best UI control to implement the history feature as seen in Windows Calculator? I also want onclick events on the history.

Answer 1

我不敢肯定你如何计算,但你可以有这样的简单类别:

enum Operator {PLUS,MINUS,DIV,MULT};

class Calculation {
    float operand1,operand2;
    Operator operator;
    public Calculation(float op1,float op2,Operator operator){
        this.operand1=op1;
        this.operand1=op2;
        this.operator=operator;
    }
}

在进行计算时,就会产生此类物体,并添加到一名阿雷拉派教徒身上:

List<Calculation> history = new ArrayList<Calculation>();// history

history.add(new Calculation(5,5,Operator.PLUS));// add a new `Calculation` to our list

然后,根据您的《国际交易日志》,以<代码>history.get( Some_integer)查阅清单。

Answer 2

Could you just use a List containing a number of previously entered calculations? If you knew the maximum possible history size in advance, you could just stick with a normal array, but a List will give you more flexibility.

Answer 3

你们需要把所有业务和成果都储存在这里。每当你开展一次行动时,每增加一次指数。为了收回过去的作业,操纵指数,并且能够取得价值。你们可以利用收集工具储存业务。

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