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部分code
JSONObject mTitle = new JSONObject(mJsonText);
 
JSONArray arrayJson=mTitle.getJSONObject("result").getJSONArray("fields");
try {
String s="";
   	for(int i = 0 ; i <arrayJson.length() ;i++){
  	JSONObject lib = arrayJson.getJSONObject(i);
  	String json = lib.toString();
  	String type = lib.getString("type");
  	String id = lib.getString("id");
   	s+=id+",";
    }
   	t1.setText("名稱：");
}

Main.java:1: error: class, interface, or enum expected
??code
^
Main.java:4: error: class, interface, or enum expected
JSONArray arrayJson=mTitle.getJSONObject("result").getJSONArray("fields");
^
Main.java:5: error: class, interface, or enum expected
try {
^
Main.java:7: error: class, interface, or enum expected
   	for(int i = 0 ; i <arrayJson.length() ;i++){
   	^
Main.java:7: error: class, interface, or enum expected
   	for(int i = 0 ; i <arrayJson.length() ;i++){
   	                ^
Main.java:7: error: class, interface, or enum expected
   	for(int i = 0 ; i <arrayJson.length() ;i++){
   	                                       ^
Main.java:9: error: class, interface, or enum expected
  	String json = lib.toString();
  	^
Main.java:10: error: class, interface, or enum expected
  	String type = lib.getString("type");
  	^
Main.java:11: error: class, interface, or enum expected
  	String id = lib.getString("id");
  	^
Main.java:12: error: class, interface, or enum expected
   	s+=id+",";
   	^
Main.java:13: error: class, interface, or enum expected
    }
    ^
Main.java:15: error: class, interface, or enum expected
}
^
12 errors

Standard output is empty