我想在我的代码中专门检查 null 或空。空和空是否相同StringBuilder
在Java中?
例如:
StringBuilder state = new StringBuilder();
StringBuilder err= new StringBuilder();
success = executeCommand(cmd, state, err);
/* here executeCommand() returns empty or null in state, I cant make changes in <br/> executeCommand() so can I check it in my code somehow for state, if its null or empty? */<br/>
if (state == null) { //do blabla1 }
if (state.tostring().equals("")) { //do blabla2 }
上面的代码有意义或者我应该如何更改它?
No, null
and empty
不同的是StringBuilder
.
StringBuilder nullBuilder = null;
if(nullBuilder == null) {
System.out.println("Builder is null");
}
&
StringBuilder emptyBuilder = new StringBuilder("");
if(emptyBuilder == null || emptyBuilder.toString().equals("")) {
System.out.println("Builder is empty");
}
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