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@Test | |
public void testString() | |
String texto = ""; | |
System.out.println("--------------------Operador + -----------------------------"); | |
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++){ | |
texto += 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----------------------------"); | |
texto = ""; | |
date = new Date(System.currentTimeMillis()); | |
String initFormat = formatter.format(date); | |
System.out.println(initFormat); | |
for(int i = 0; i < 100000; i++){ | |
texto = String.format("%s%dtext", texto, 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----------------------------"); | |
texto = ""; | |
date = new Date(System.currentTimeMillis()); | |
String initConcat = formatter.format(date); | |
System.out.println(initConcat); | |
for(int i = 0; i < 100000; i++){ | |
texto = texto.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 textoS = new StringBuilder(); | |
date = new Date(System.currentTimeMillis()); | |
String initStringBuilder = formatter.format(date); | |
System.out.println(initStringBuilder); | |
for(int i = 0; i < 100000; i++){ | |
textoS.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 textoSB = new StringBuffer(); | |
date = new Date(System.currentTimeMillis()); | |
String initStringBuffer = formatter.format(date); | |
System.out.println(initStringBuffer); | |
for(int i = 0; i < 100000; i++){ | |
textoSB.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)) ); | |
} |
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//10x menos itens no loop | |
--------------------Operador + ----------------------------- | |
17:13:27:330 | |
17:14:07:718 | |
tempo : 80388 | |
-------------------String Format---------------------------- | |
17:14:07:723 | |
17:15:55:196 | |
tempo : 147473 | |
-------------------String concat---------------------------- | |
17:15:55:198 | |
17:16:46:805 | |
tempo : 91607 | |
-------------------String Builder--------------------------- | |
17:16:46:806 | |
17:16:46:819 | |
tempo : 13 | |
-------------------String Buffer--------------------------- | |
17:16:46:820 | |
17:16:46:854 | |
tempo: 34 |
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