Bugzilla – Full Text Bug Listing
| Summary: | Using the operator += with a String on the right side results in a compile error. | ||
|---|---|---|---|
| Product: | [Eclipse Project] JDT | Reporter: | Robert Baccus <rbaccus> |
| Component: | Core | Assignee: | JDT-Core-Inbox <jdt-core-inbox> |
| Status: | RESOLVED INVALID | QA Contact: | |
| Severity: | normal | ||
| Priority: | P3 | ||
| Version: | 2.1 | ||
| Target Milestone: | 3.0 M1 | ||
| Hardware: | PC | ||
| OS: | Windows XP | ||
| Whiteboard: | |||
This is a bug in javac 1.4.1_02 which has been fixed in 1.4.2_b19.
D:\temp>java -version
java version "1.4.2-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-beta-b19)
Java HotSpot(TM) Client VM (build 1.4.2-beta-b19, mixed mode)
D:\temp>javac X1.java
X1.java:17: incompatible types
found : java.lang.Object
required: java.lang.String
oa[i] += " | " + rowTotal + " |";
^
X1.java:19: incompatible types
found : java.lang.Object
required: java.lang.String
oa[i] += " " + intArray[j] + " ";
^
X1.java:21: incompatible types
found : java.lang.Object
required: java.lang.String
oa[i] += "| "
^
3 errors
See http://developer.java.sun.com/developer/bugParade/bugs/4642850.html for
further reference.
Closed as INVALID.
|
The following code segment will fail to compile using the Eclipse JDT. int[] intArray; Object[] oa = hash.keySet().toArray(); Arrays.sort(oa); // mmmmm, Java.util.Arrays for (int i=0; i< oa.length; i++) { intArray=(int[])hash.get(oa[i]); int rowTotal = intArray[0] + intArray[1] + intArray[2]; while (((String) oa[i]).length() < 4) { // pad w/ leading '0's as needed oa[i]= "0" + oa[i]; } FAILS oa[i] += " | " + rowTotal + " |"; for (int j=0; j<intArray.length-1; j++) { FAILS oa[i] += " " + intArray[j] + " "; } FAILS oa[i] += "| " + intArray[intArray.length-1] + "/" + (rowTotal- intArray[intArray.length-1]); System.out.println(oa[i]); } System.out.println(); } The error message is "The operator += is undefined for the argument type(s) Object, String" When compiled using ANT with JDK1.4.1_02 this compiles and runs without errors.