[英]Returning an array from a method
這是在主要班級
actionsClass actionObject = new actionsClass(tipArray, hourArray,
hourlyWageInput, gasArray, wageArray, incomeArray, totalHourlyEarnings,
totalGas, totalHours, avgGasLabel);
actionObject.calculateTable();
這是我的類,我試圖實現該方法(目前有過多的聲明變量):
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class actionsClass {
private JLabel hourlyWage, blank, row2, totalTips, totalHours, totalHourlyEarnings,
totalPay, weekPay, day, totalGas, totalHoursLabel, totalTipsLabel, totalGasLabel,
totalWageLabel, avgGas, avgGasLabel;
private JTextField hourlyWageInput;
private double incomeArray[] = new double[7];
private JTextField tipArray[] = new JTextField[7];
private JTextField hourArray[] = new JTextField[7];
private JTextField gasArray[]= new JTextField[7];
private JLabel wageArray[] =new JLabel[7];
public actionsClass() {
}
public actionsClass(JTextField[] tipArray, JTextField[] hourArray,
JTextField hourlyWageInput, JTextField[] gasArray,
JLabel[] wageArray, double[] incomeArray,
JLabel totalHourlyEarnings, JLabel totalGas, JLabel totalHours,
JLabel avgGasLabel) {
this.tipArray = tipArray;
this.hourArray = hourArray;
this.hourlyWageInput = hourlyWageInput;
this.gasArray = gasArray;
this.wageArray = wageArray;
this.incomeArray = incomeArray;
this.totalHourlyEarnings = totalHourlyEarnings;
this.totalGas = totalGas;
this.totalHours = totalHours;
this.avgGasLabel = avgGasLabel;
}
public String calculateTable (){
for (int i = 0; i < 7; i++) {
double tipx = Double.parseDouble(tipArray[i].getText());
double houry = Double.parseDouble(hourArray[i].getText());
double hourlyz = Double.parseDouble(hourlyWageInput.getText());
String[] wageArrayStrings = null;
if (houry != 0 ){
wageArrayStrings[i] = String.format("%.2f", (hourlyz*houry+tipx)/houry);
}
else {
wageArrayStrings[i] = ("$ 0.00");
}
}
return wageArrayStrings[];
}
}
return wageArrayStrings []存在語法錯誤; 帶或不帶括號。 我究竟做錯了什么?
首先,返回類型應為String[]
。
然后你需要初始化數組(如@MattBall指出,在循環之前):
String[] wageArrayStrings = new String[7];
for (int i = 0; i < 7; i++) {
那你可以做
return wageArrayStrings;
它應該只是返回wageArrayStrings
; 不需要方括號和返回類型應該是String[]
而不是String
(假設你的意圖是返回String數組)。
它應該只是(改變函數返回類型) -
public String[] calculateTable () {
//// your code.
return wageArrayStrings;
}
此外,您還沒有初始化您的陣列。 你應該在for循環之前做到這一點。
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