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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.
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.
