Java 布尔运算符的 StringFormat
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StringFormat for Java Boolean Operator
提问by Umesh Patil
I know its very simple question. but I would like to know the stringformat for boolean operator. For example, below shows the string formats for integer, string and float. what could be for boolean operator true/false?
我知道它非常简单的问题。但我想知道布尔运算符的字符串格式。例如，下面显示了整数、字符串和浮点数的字符串格式。布尔运算符真/假可能是什么？
System.out.printf("The value of the float " +
"variable is %f, while " +
"the value of the " +
"integer variable is %d, " +
"and the string is %s",
floatVar, intVar, stringVar);
采纳答案by LMK
'b' or 'B' general If the argument arg is null, then the result is "false". If arg is a boolean or Boolean, then the result is the string returned by String.valueOf(arg). Otherwise, the result is "true". java docs : http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#syntax
'b' 或 'B' 一般 如果参数 arg 为空，则结果为“false”。如果 arg 是布尔值或布尔值，则结果是 String.valueOf(arg) 返回的字符串。否则，结果为“真”。java 文档：http: //docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#syntax
回答by Jens
The placeholder for boolean is %b
布尔值的占位符是 %b
回答by Zhenxiao Hao
System.out.printf("boolean variable is %b",boolVar);
回答by Ruchira Gayan Ranaweera
You can try this
你可以试试这个
float floatVar=1.0f;
int intVar=1;
String stringVar="hi";
boolean boolVar=false;
System.out.printf("The value of the float " +
"variable is %f, while " +
"the value of the " +
"boolean variable is %b, " +
"and the string is %s",
floatVar, boolVar, stringVar);
%bis you are looking at
%b你在看吗
回答by Chris Martin
System.outis a PrintStreamand the documentation for PrintStream.printflinks to the format stream syntaxwhich has a table of all of the conversions. The first entry in that table:
System.out的是的PrintStream和文档PrintStream.printf链接到格式流语法具有所有的转换表。该表中的第一个条目：
'b','B'- If the argument argisnull, then the result is"false". If argis abooleanorBoolean, then the result is the string returned byString.valueOf(arg). Otherwise, the result is"true".
'b','B'- 如果参数arg为null，则结果为"false"。如果arg是 aboolean或Boolean，则结果是由 返回的字符串String.valueOf(arg)。否则，结果是"true"。
回答by Ninad Pingale
One more way is -
另一种方法是——
String output = String.format("boolean variable is %b",true);
System.out.print(output);
