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进出口运行一些代码,并期望得到送到Systen.err在一个点出来一个特定的消息,但由于某种原因它的现身在另一点。下面是代码 -Eclipse的标准输出/错误同步
public static void main(String[] args) throws Exception {
System.out.println("File 1:");
for (NormalizedEntity ne : theSolution.entities.values()){
System.out.println(ne);
}
System.out.println("\nFile 2:");
for (NormalizedEntity ne : theSubmission.entities.values()){
System.out.println(ne);
}
System.out.println(check());
}
static String check() {
StringBuilder resultString = new StringBuilder();
System.out.println("\nstarting check");
for (NormalizedEntity solutionEntity : theSolution.entities.values()){
NormalizedEntity submissionEntity = theSubmission.entities.get(solutionEntity.name);
if(solutionEntity instanceof NormalizedClass){
if(!(submissionEntity instanceof NormalizedClass)){
System.err.println("***WARNING: solutionEntity " + solutionEntity + "is a class but submissionEntity " + submissionEntity + " is not");//<---This line should be second to last
resultString.append("Expected " + submissionEntity + " to be a class called " + solutionEntity);
}
}
//System.out.println("Found: " + ne + " in both");
}
return resultString.toString();
}
,这里是输出 -
***WARNING: solutionEntity Class C {x=private int x, y=private int y} {C=C{1thParam=int, 2thParam=int}} {getX=int getX{}}is a class but submissionEntity null is not <--------- THIS LINE SHOULD BE AT THE END
File 1:
Class C {x=private int x, y=private int y} {C=C{1thParam=int, 2thParam=int}} {getX=int getX{}}
Class SubC {z=private int z} {} {}
C c
double d
int f{}
int i
SubC subC
File 2:
Class D {x=private int x, y=private int y} {D=D{1thParam=int, 2thParam=int}} {getX=int getX{}}
Class SubC {z=private int z} {} {}
D c
double d
int f{}
int i
SubC subC
starting check
Expected null to be a class called Class C {x=private int x, y=private int y} {C=C{1thParam=int, 2thParam=int}} {getX=int getX{}}
现在基于代码输出的第一行应该是倒数第二行。但是,当我在eclipse中运行它时,它会作为第一行出现。为什么是这样?我还注意到,如果我将System.err
更改为System.out
,则按预期发布。所以看起来Eclipse首先收集所有的错误输出,然后处理标准输出?
'err'优先,并立即被打印出来。我曾经有过在一行中间打印堆栈轨迹的情况。 – 2013-06-21 17:22:30