java - 如何用Java编写IF-ELSE语句

Question

我们正在尝试使用 eclipse (Talend DI TOOL) 将计算字段作为发货日期 if-then-else 语句写入 java

环境: 我们正在努力创造人才就业机会。

source systems (sql server and excel file)---->tmap---->Target system(Excel file)

输入表达式:if-then-else公式

发货日期

if ([Customer])='0000001' or 
(TRIM([Corp Acct Name]))='GENERAL' or (TRIM([Corp Acct Name]))='ABC' or (TRIM([Corp Acct Name]))='XYZ'
or (TRIM([Corp Acct Name]))='CDE' then ([ShipDate]) 
elseif DATEPART('weekday',([MABD])) =1 and [Total Lead Time]<=5 then (([MABD])-[Total Lead Time]-2)
elseif DATEPART('weekday',([MABD])) =1 and [Total Lead Time]>5 then (([MABD])-[Total Lead Time]-4)
elseif DATEPART('weekday',([MABD])) =2 and [Total Lead Time]<=1 then (([MABD])-[Total Lead Time])
elseif DATEPART('weekday',([MABD])) =2 and [Total Lead Time]<=6 then (([MABD])-[Total Lead Time]-2)
elseif DATEPART('weekday',([MABD])) =2 and [Total Lead Time]>6 then (([MABD])-[Total Lead Time]-4)
elseif DATEPART('weekday',([MABD])) =3 and [Total Lead Time]<=2 then (([MABD])-[Total Lead Time])
elseif DATEPART('weekday',([MABD])) =3 and [Total Lead Time]<=7 then (([MABD])-[Total Lead Time]-2)
elseif DATEPART('weekday',([MABD])) =3 and [Total Lead Time]>7 then (([MABD])-[Total Lead Time]-4)
elseif DATEPART('weekday',([MABD])) =4 and [Total Lead Time]<=3 then (([MABD])-[Total Lead Time])
elseif DATEPART('weekday',([MABD])) =4 and [Total Lead Time]<=8 then (([MABD])-[Total Lead Time]-2)
elseif DATEPART('weekday',([MABD])) =4 and [Total Lead Time]>8 then (([MABD])-[Total Lead Time]-4)
elseif DATEPART('weekday',([MABD])) =5 and [Total Lead Time]<=4 then (([MABD])-[Total Lead Time])
elseif DATEPART('weekday',([MABD])) =5 and [Total Lead Time]<=9 then (([MABD])-[Total Lead Time]-2)
elseif DATEPART('weekday',([MABD])) =5 and [Total Lead Time]>9 then (([MABD])-[Total Lead Time]-4)
elseif DATEPART('weekday',([MABD])) =6 and [Total Lead Time]<=4 then (([MABD])-[Total Lead Time]-1)
elseif DATEPART('weekday',([MABD])) =6 and [Total Lead Time]<=9 then (([MABD])-[Total Lead Time]-3)
elseif DATEPART('weekday',([MABD])) =6 and [Total Lead Time]>9 then (([MABD])-[Total Lead Time]-5)
elseif DATEPART('weekday',([MABD])) =7 and [Total Lead Time]<=4 then (([MABD])-[Total Lead Time]-2)
elseif DATEPART('weekday',([MABD])) =7 and [Total Lead Time]<=9 then (([MABD])-[Total Lead Time]-4)
elseif DATEPART('weekday',([MABD])) =7 and [Total Lead Time]>9 then (([MABD])-[Total Lead Time]-6)
END

我们尝试了 :talend 中的 Ternery 运算符

row1.customer='0000001'|| trim(row1.CorpAcctName)='GENERAL'|| trim(row1.CorpAcctName)='ABC' or trim(row1.CorpAcctName)='XYZ or trim(row1.CorpAcctName)=='SCDE' ||?row1.ShipDate:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD)=1)-1) and row2.L+1<5?row1.MABD-row2.L+1-2:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=1)-1) and row2.L+1>5?row1.MABD-row2.L+1-4:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=2)-1) and row2.L+1<=1?row1.MABD-row2.L+1:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=2)-1) and row2.L+1<=6?row1.MABD-row2.L+1-2:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=2)-1) and row2.L+1>6?row1.MABD-row2.L+1-4:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=3)-1) and row2.L+1<=2?row1.MABD-row2.L+1:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=3)-1) and row2.L+1<=7?row1.MABD-row2.L+1-2:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=3)-1) and row2.L+1>7?row1.MABD-row2.L+1-4:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=4)-1) and row2.L+1<=3?row1.MABD-row2.L+1:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=4)-1) and row2.L+1<=8?row1.MABD-row2.L+1-2:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=4)-1) and row2.L+1>8?row1.MABD-row2.L+1-4:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=5)-1) and row2.L+1<=4?row1.MABD-row2.L+1:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=5)-1) and row2.L+1<=9?row1.MABD-row2.L+1-2:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=5)-1) and row2.L+1>9?row1.MABD-row2.L+1-4:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=6)-1) and row2.L+1<=4?row1.MABD-row2.L+1-1:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=6)-1) and row2.L+1<=9?row1.MABD-row2.L+1-3:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=6)-1) and row2.L+1>9?row1.MABD-row2.L+1-5:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=7)-1) and row2.L+1<=4?row1.MABD-row2.L+1-2:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=7)-1) and row2.L+1<=9?row1.MABD-row2.L+1-4:
Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=7)-1) and row2.L+1>9?row1.MABD-row2.L+1-6:""

如果有任何帮助，我们将不胜感激？

Answer 1

首先，你的表达式中有多个语法错误:如果你想比较 2 个 Int，正确的运算符是“==”。 (如果你想比较两个字符串，你应该使用 "0000001".equals(row1.customer))。

这个表达没有意义:

 Integer.toString (TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD=1)-1)

如果您想将 DAY_OF_WEEK 与 1 进行比较，请使用

(TalendDate.getPartOfDate("DAY_OF_WEEK",row1.MABD)-1) ==1

然后，在 tMap 中使用原始三元运算符可能不是最好的做法:它并不真正适合像这样的复杂表达式(没有可用的注释，不可能重用)。您应该在“例程”部分中创建一个方法，并为其提供 row1.customer、row1.CorpAcctName、row1.ShipDate、row1.MABD 作为参数。 在此例程方法中，您可以使用 IF/ELSE 运算符，而这些运算符不能直接在 tMap 中使用。

  public static int myFunction(String customer,String CorpAcctName,Integer ShipDate,Integer MABD) {
//adding comment is possible here
            if ("0000001".equals(customer).......) {

然后在 tMap 中，您只需在表达式构造函数中调用函数即可。