new Boolean("true")
new Boolean("false")
String flag = "true"; String url; if (new Boolean(flag)) { url = String.format("name = %s & age = %s", "haha", 12);//name = haha & age = 12 } else { url = String.format("name = %s & age = %s", "xixi", 13);//name = xixi & age = 13 } System.out.println(url); // name = haha & age = 12