java.lang.Boolean.valueOf(String s)

简单说，就是s为true（这四个字母大小写任意）时，返回值为true，否则为false

 1 public class one {
 2     
 3     public static void main(String[] args) {
 4           Boolean b1, b2;
 5 
 6           // create 2 String's and assign values
 7           String s1 = null;
 8           String s2 = "truE";
 9 
10           /**
11            *  static method is called using class name 
12            *  assign result of valueOf method on s1, s2 to b1, b2
13            */
14           b1 = Boolean.valueOf(s1);
15           b2 = Boolean.valueOf(s2);
16           
17           System.out.println(b1);
18           System.out.println(b2);
19           String str1 = "Boolean instance of string " + s1 + " is "  + b1;
20           String str2 = "Boolean instance of string " + s2 + " is "  + b2;
21 
22           // print b1, b2 values
23           System.out.println( str1 );
24           System.out.println( str2 );
25     }
26 }

执行结果为：