StringTest.java

	@Test
	public void testString(){
		
		
		System.out.println("--------------------Operador + -----------------------------");
		String textoOperador = "";
		
		Date date = new Date(System.currentTimeMillis());
		DateFormat formatter = new SimpleDateFormat("HH:mm:ss:SSS");
		String initOperador = formatter.format(date);
		System.out.println(initOperador);
		for(int i = 0; i < 100000; i++){
			textoOperador =  textoOperador + "text" + i + "text";
		}
		date = new Date(System.currentTimeMillis());
		String fimOperador = formatter.format(date);
		System.out.println(fimOperador);
		BigDecimal a = new BigDecimal(initOperador.replaceAll(":", ""));
		BigDecimal b = new BigDecimal(fimOperador.replaceAll(":", ""));
		System.out.println("tempo : " + b.subtract(a) );
		
		System.out.println("-------------------String Format----------------------------");
		String textoFormat = "";
		
		date = new Date(System.currentTimeMillis());
		String initFormat = formatter.format(date);
		System.out.println(initFormat);
		for(int i = 0; i < 100000; i++){
			textoFormat = String.format("%s text %s text", textoFormat, i);
		}
		date = new Date(System.currentTimeMillis());
		String fimFormat = formatter.format(date);
		System.out.println(fimFormat);
		BigDecimal c = new BigDecimal(initFormat.replaceAll(":", ""));
		BigDecimal d = new BigDecimal(fimFormat.replaceAll(":", ""));
		System.out.println(String.format("tempo : %s", d.subtract(c)) );
		
		System.out.println("-------------------String concat----------------------------");
		String textoConcat = "";
		
		date = new Date(System.currentTimeMillis());
		String initConcat = formatter.format(date);
		System.out.println(initConcat);
		for(int i = 0; i < 100000; i++){
			textoConcat = new String().concat(textoConcat).concat("text").concat(String.valueOf(i)).concat("text"); 
		}
		date = new Date(System.currentTimeMillis());
		String fimConcat = formatter.format(date);
		System.out.println(fimConcat);
		BigDecimal e = new BigDecimal(initConcat.replaceAll(":", ""));
		BigDecimal f = new BigDecimal(fimConcat.replaceAll(":", ""));
		System.out.println(new String("tempo : ").concat(f.subtract(e).toPlainString()));
		
			
		System.out.println("-------------------String Builder---------------------------");
		StringBuilder  textoBuilder = new StringBuilder();
		
		date = new Date(System.currentTimeMillis());
		String initStringBuilder = formatter.format(date);
		System.out.println(initStringBuilder);
		for(int i = 0; i < 100000; i++){
			textoBuilder = textoBuilder.append(String.valueOf(i)).append("text");
		}
		date = new Date(System.currentTimeMillis());
		String fimStringBuilder = formatter.format(date);
		System.out.println(fimStringBuilder);
		BigDecimal g = new BigDecimal(initStringBuilder.replaceAll(":", ""));
		BigDecimal h = new BigDecimal(fimStringBuilder.replaceAll(":", ""));
		System.out.println(new StringBuilder("tempo : ").append(h.subtract(g)));
		
		System.out.println("-------------------String Buffer---------------------------");
		StringBuffer textoBuffer = new StringBuffer();
		
		date = new Date(System.currentTimeMillis());
		String initStringBuffer = formatter.format(date);
		System.out.println(initStringBuffer);
		for(int i = 0; i < 100000; i++){
			textoBuffer = textoBuffer.append("text").append(String.valueOf(i)).append("text");
		}
		date = new Date(System.currentTimeMillis());
		String fimStringBuffer = formatter.format(date);
		System.out.println(fimStringBuffer);
		BigDecimal i = new BigDecimal(initStringBuffer.replaceAll(":", ""));
		BigDecimal j = new BigDecimal(fimStringBuffer.replaceAll(":", ""));
		System.out.println(new StringBuffer("tempo: ").append(j.subtract(i)) );
	
	}
	

TestResult.txt

--------------------Operador + -----------------------------
16:57:38:651
16:58:41:453
tempo : 102802
-------------------String Format----------------------------
16:58:41:455
17:00:45:106
tempo : 4203651
-------------------String concat----------------------------
17:00:45:106
17:02:30:415
tempo : 185309
-------------------String Builder---------------------------
17:02:30:416
17:02:30:444
tempo : 28
-------------------String Buffer---------------------------
17:02:30:444
17:02:30:483
tempo: 39