gson MutableJsonReader example

json_mutable_writer_test.java

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/*
sample_code_java0
File: json_mutable_writer_test.java
Created on: Oct 10, 2020 12:43:02 PM
    @author https://github.com/911992
 
History:
    initial version: 0.1(20201010)
*/

package json_mutable_test;

import com.google.gson.stream.MutableJsonWriter;
import java.io.StringWriter;
import junit.framework.TestCase;


/**
 * 
 * @author https://github.com/911992
 */
public class json_mutable_writer_test extends TestCase{

    public void testMutability() throws Exception{
        MutableJsonWriter _shared_writer = new MutableJsonWriter();
        final String _a = "happy";
        final String _b = "opensource";
        
        String _val = "911";
        String _expected_json=String.format("{\"%s\":\"%s\",\"%s\":\"%s\"}", _a,_val,_b,_val);
        System.out.printf("Run 0:\n");
        System.out.printf("Expected json:  %s\n",_expected_json);
        StringWriter _str_writer = new StringWriter();
        _shared_writer.reset(_str_writer);
        _shared_writer.beginObject();
        _shared_writer.name(_a);
        _shared_writer.value(_val);
        _shared_writer.name(_b);
        _shared_writer.value(_val);
        _shared_writer.endObject();
        _shared_writer.flush();
        _shared_writer.close();
        String _gen_json = _str_writer.toString();
        System.out.printf("Generated json: %s\n",_gen_json);
        System.out.printf("Pass:%s\n",Boolean.toString(_expected_json.equals(_gen_json)));
        assertEquals(_expected_json, _gen_json);
        
        System.out.println("");
        
        _val = "992";
        _expected_json=String.format("{\"%s\":\"%s\",\"%s\":\"%s\"}", _a,_val,_b,_val);
        System.out.printf("Run 1:\n");
        System.out.printf("Expected json:  %s\n",_expected_json);
        _str_writer = new StringWriter();
        _shared_writer.reset(_str_writer);
        _shared_writer.beginObject();
        _shared_writer.name(_a);
        _shared_writer.value(_val);
        _shared_writer.name(_b);
        _shared_writer.value(_val);
        _shared_writer.endObject();
        _shared_writer.flush();
        _shared_writer.close();
        _gen_json = _str_writer.toString();
        System.out.printf("Generated json: %s\n",_gen_json);
        System.out.printf("Pass:%s\n",Boolean.toString(_expected_json.equals(_gen_json)));
        assertEquals(_expected_json, _gen_json);
    }
    
    public static void main(String[] args)throws Throwable {
        new json_mutable_writer_test().testMutability();
    }
}