string-vs-stringbuilder.html

public static void main(String[] args) {
		String s = "";
		long tempsDebutString = System.currentTimeMillis();
		for(int i=0; i<200;i++){
		  for(int j=0; j<200;j++){
		    s += "+ x_" + i + "_" + j+"ok";
		  }
		}

		long tempsFinString = System.currentTimeMillis();
		float secondsString = (tempsFinString - tempsDebutString) / 1000F;
		System.out.println(secondsString);

		StringBuilder sb = new StringBuilder();
		long tempsDebutStringBuilder = System.currentTimeMillis();
		for(int i=0; i<200;i++){
		  sb = new StringBuilder();
		  for(int j=0; j<200;j++){
			sb.append("+ x_");
		    sb.append(i);
		    sb.append("_");
		    sb.append(j);
		    sb.append("ok");
		  }
		}
		long tempsFinStringBuilder = System.currentTimeMillis();
		float secondsStringBuilder = (tempsFinStringBuilder - tempsDebutStringBuilder) / 1000F;
		System.out.println(secondsStringBuilder);

		final String X = "+ x_";
		final String U = "_";
		final String O = "ok";
		sb = new StringBuilder();
		long tempsDebutStringBuilder2 = System.currentTimeMillis();
		for(int i=0; i<200;i++){
		  sb = new StringBuilder();
		  for(int j=0; j<200;j++){
			sb.append(X);
		    sb.append(i);
		    sb.append(U);
		    sb.append(j);
		    sb.append(O);
		  }
		}
		long tempsFinStringBuilder2 = System.currentTimeMillis();
		float secondsStringBuilder2 = (tempsFinStringBuilder2 - tempsDebutStringBuilder2) / 1000F;
		System.out.println(secondsStringBuilder2);

}