Commit 29900f9

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Challenge 48.

String, StringBuffer, immutability.

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	`1`	`+package challenge41_50;`
	`2`	`+`
	`3`	`+/**`
	`4`	`+ * StringBuffer threadSafe`
	`5`	`+ * StringBuilder not threadSafe`
	`6`	`+ * String are immutable, StringBuffer are not.`
	`7`	`+ */`
	`8`	`+public class Challenge_48 {`
	`9`	`+`
	`10`	`+ public static void main( String[] args ) {`
	`11`	`+ String s = "Height";`
	`12`	`+ StringBuffer stringBuffer = new StringBuffer("sword");`
	`13`	`+ testRefs(s,stringBuffer);`
	`14`	`+ System.out.println("s = " + s+" sb = " + stringBuffer);`
	`15`	`+ }`
	`16`	`+`
	`17`	`+ static void testRefs(String str, StringBuffer stringBuffer){`
	`18`	`+ str = str + stringBuffer.toString();`
	`19`	`+ stringBuffer.append(str);`
	`20`	`+ str=null;`
	`21`	`+ stringBuffer=null;`
	`22`	`+ }`
	`23`	`+}`

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