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

public class one {
    
    public static void main(String[] args) {
          Boolean b1, b2;

          // create 2 String's and assign values
          String s1 = null;
          String s2 = "truE";

          /**
           *  static method is called using class name 
           *  assign result of valueOf method on s1, s2 to b1, b2
           */
          b1 = Boolean.valueOf(s1);
          b2 = Boolean.valueOf(s2);
          
          System.out.println(b1);
          System.out.println(b2);
          String str1 = "Boolean instance of string " + s1 + " is "  + b1;
          String str2 = "Boolean instance of string " + s2 + " is "  + b2;

          // print b1, b2 values
          System.out.println( str1 );
          System.out.println( str2 );
    }
}

执行结果为：