java日历“上个月”的日期安排

Question

我正在尝试在我的applet上正确显示日期。我希望它能够从总天数开始向后计数到零，从上一个月的第一个停止之后的右边开始。 current是当前月份，数组来自索引0 - 11。

if (evt.getSource()==last){//NOT CURRENTLY WORKING...
        current--;
        if(current == -1){//resets to February
            current = 11;
            year--;
            String now = "Year " +year;
            showYear.setText(now);
        }
        month.setText(months[current]);

        stringParse = Integer.parseInt(monthDays[current]);
        for (int i = 0; i < 7; i++){//check first week
            if(allDays[i].getText().equals("1")){
                dateHold =i;//plus then minus to fix index and next month
            }
        }
        for(int j = 0; j < 37; j++)//erase dates
            allDays[j].setText("");

        int something;//local number holder

        int countDown = stringParse;//local count down for reverse printing
        if(current ==1 && year%4!=0)//February fix
            countDown = 28;
        something = countDown - 1 + (dateHold);
        for (int i = 36; i >0; i--){//reverse date printing


            if(((36 -i)-dateHold)>stringParse)//if date over max
                continue;


            if(something < 0)
                continue;

            try{//kept reaching out of index here
            allDays[something].setText("" + (countDown));
            //System.out.println("i:" + i + "\ndateHold:" + dateHold + "\ncountDown:" + countDown);
            }
            catch(ArrayIndexOutOfBoundsException e){
                System.out.println("error i:" + i + "\ndateHold:" + dateHold + "\ncountDown:" + countDown);
            }
            countDown--;
            something--;
            if(countDown <= 0)
                break;
        }
        for(int i = 0; i < 37; i++){
            eventMarker[i].setText("");
        }

    }//end last evt