Question

我创建了一个计算器，可以进行简单的计算，如9 + 8 = 17或10 * 3 = 30但是我想制作一个可以执行多种操作的计算器，如9 * 5/2或9 * 5 * 6等。

这是我的代码：

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==zero){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("0");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"0");
                }
            }
        }
        else if(e.getSource()==one){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("1");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"1");
                }
            }
        }
        else if(e.getSource()==two){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("2");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"2");
                }
            }
        }
        else if(e.getSource()==three){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("3");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"3");
                }
            }
        }
        else if(e.getSource()==four){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("4");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"4");
                }
            }
        }
        else if(e.getSource()==five){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("5");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"5");
                }
            }
        }
        else if(e.getSource()==six){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("6");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"6");
                }
            }
        }
        else if(e.getSource()==seven){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("7");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"7");
                }
            }
        }
        else if(e.getSource()==eight){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("8");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"8");
                }
            }
        }
        else if(e.getSource()==nine){
            if(answerField.getText().length()<16){
                if(clearField ==1){
                    answerField.setText("9");
                    clearField = 0;
                }
                else{
                    answerField.setText(answerField.getText()+"9");
                }
            }
        }
        else if(e.getSource()== negativePositive){
            if(answerField.getText().equals("")||answerField.getText().equals("-")){
                answerField.setText("-");
            }
            else{
                negativePositive1 = (Double.parseDouble(String.valueOf(answerField.getText())));
                negativePositive1 *= -1;
                answerField.setText(String.valueOf(negativePositive1));
            }
        }
        else if(e.getSource()==clear){
            answerField.setText("");
            num1 = 0;
            num2 = 0;
            addClick = 0;
            subClick = 0;
            divClick = 0;
            multiClick = 0;

        }
        else if(e.getSource()==decimal){
            if(answerField.getText().contains(".")){
                answerField.setText(answerField.getText());
            }
            else{
            answerField.setText(answerField.getText()+".");
            }
        }
        else if(e.getSource()==add){
            if(answerField.getText()!=null){
                num1 = Double.parseDouble(String.valueOf(answerField.getText()));
                addClick = 1;
                clearField = 1;
            }
        }
        else if(e.getSource()==Subtract){
            if(answerField.getText()!=null){
                num1 = Double.parseDouble(String.valueOf(answerField.getText()));
                subClick = 1;
                clearField = 1;
            }
        }
        else if(e.getSource()==multiply){
            if(answerField.getText()!=null){
                num1 = Double.parseDouble(String.valueOf(answerField.getText()));
                multiClick = 1;
                clearField = 1;
            }
        }
        else if(e.getSource()==divide){
            if(answerField!=null){
            answerField.setText(answerField.getText()+"/");
            }
            if(answerField.getText()!=null){

                num1 = Double.parseDouble(String.valueOf(answerField.getText()));
                divClick = 1;
                clearField = 1;
            }
        }
        else if(e.getSource()==equal){
            num2 = Double.parseDouble(String.valueOf(answerField.getText()));
            answerField.setText(answerField.getText());
            if(addClick ==1){
                ans = num1+num2;
                answerField.setText(String.valueOf(ans));
                addClick = 0;
            }
            if(subClick ==1){
                ans = num1-num2;
                answerField.setText(String.valueOf(ans));
                subClick = 0;
            }
            if(multiClick ==1){
                ans = num1*num2;
                answerField.setText(String.valueOf(ans));
                multiClick = 0;
            }
            if(divClick ==1){
                ans = Num1/Num2;
                answerField.setText(String.valueOf(ans));
                divClick = 0;
            }

        }

    }

任何人都知道我会如何处理这个问题？我知道我错过了什么

Answer 1

考虑这个例子你有3个按钮：add，substract和equals

private int number = 0;
private void setNumber(int no){
    this.number = no;
}
private Integer getNumber(){
    return this.number;
}
private void addActionPerformed(java.awt.event.ActionEvent evt) {       
    int i = 1;
    int newAddedNumber = this.number + i;
    setNumber(newAddedNumber);
}   
private void substractActionPerformed(java.awt.event.ActionEvent evt) {                                  
    int i = 1;
    int newSubtractedNumber = this.number - i;
    setNumber(newSubstractedNumber);
}
private void equalsActionPerformed(java.awt.event.ActionEvent evt) {
   int displayCurrentNo = getNumber();
   System.out.println("current Number is : "  + displayCurrentNo) 
}

这应该只是在当前号码中添加或删除1。它唯一的例子，可能没有必要可编译，但这应该给你一个想法。

计算器如何制作可以执行多项操作的计算器

1 个答案: