description:
Boolean (String s), if the String parameter is not null and equals "true" when case is ignored, create a Boolean object that represents the true value, such as Boolean b = new Boolean ("ok"), which is false.
-
in Boolean b = new Boolean ("ok"), isn"t the value of b true? Is the above description contradictory
is still false. Just take a look at the source code. Only in the case of "true" is true,. All the others are false:
public static boolean parseBoolean(String s) {
return ((s != null) && s.equalsIgnoreCase("true"));
} Let's start with the conclusion: false
public Boolean(String s) {
this(parseBoolean(s));
} will first call parseBoolean , and then call another constructor method:
public Boolean(boolean value) {
this.value = value;
} well, let's take a look at parseBoolean Code:
public static boolean parseBoolean(String s) {
return ((s != null) && s.equalsIgnoreCase("true"));
} so unless the constructor parameter is "TRUE" or "true" or TRue , the result will all be false , including "ok" the string
is equal to "true" when case is ignored, where true is a quoted string
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