java json怎么取值_java – 如何从Json中提取值

看这个代码我在应用程序中使用了什么

String data="{'foo':'bar','coolness':2.0, 'altitude':39000, 'pilot':{'firstName':'Buzz','lastName':'Aldrin'}, 'mission':'apollo 11'}";

我这样检索

JSONObject json = (JSONObject) (data);

double coolness = ( "coolness" );

int altitude = ( "altitude" );

JSONObject pilot = ("pilot");

String firstName = ("firstName");

String lastName = ("lastName");

( "Coolness: " + coolness );

( "Altitude: " + altitude );

( "Pilot: " + lastName );