[英]Returning an array from a method
THis is in the main class 这是在主要班级
actionsClass actionObject = new actionsClass(tipArray, hourArray,
hourlyWageInput, gasArray, wageArray, incomeArray, totalHourlyEarnings,
totalGas, totalHours, avgGasLabel);
actionObject.calculateTable();
This is my class where I am trying to implement the method (there are currently excessive declared variables): 这是我的类,我试图实现该方法(目前有过多的声明变量):
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[];
}
} }
There is a syntax error on return wageArrayStrings[]; return wageArrayStrings []存在语法错误; with or without brackets.
带或不带括号。 What am I doing wrong?
我究竟做错了什么?
First, the return type should be String[]
. 首先,返回类型应为
String[]
。
Then you need to initialize the array (as @MattBall points out, before the loop): 然后你需要初始化数组(如@MattBall指出,在循环之前):
String[] wageArrayStrings = new String[7];
for (int i = 0; i < 7; i++) {
Then you can do 那你可以做
return wageArrayStrings;
It should be just return wageArrayStrings
; 它应该只是返回
wageArrayStrings
; no need of square brackets and return type should be String[]
instead String
(assuming your intention is returning String array). 不需要方括号和返回类型应该是
String[]
而不是String
(假设你的意图是返回String数组)。
It should simply be (changed function returned type too) - 它应该只是(改变函数返回类型) -
public String[] calculateTable () {
//// your code.
return wageArrayStrings;
}
Also, you have not initialized your array. 此外,您还没有初始化您的阵列。 You should do that before the for loop.
你应该在for循环之前做到这一点。
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