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public class Test {
public static void stringUpd(String str) {
str = str.replace("j", "l");
System.out.println(str);
}

public static void stringBufferUpd(StringBuffer bf) {
bf.append("c");
System.out.println(bf);
}

public static void main(String[] args) {

/**
* 對춻ù±¾類ÐͺÍ×Ö·û´®£¨ÌØÊ⣩ÊÇ傳Öµ
*
* 輸³ölava,java
*/
String s1 = new String("java");
stringUpd(s1);
System.out.println(s1);


/**
* 對ì¶對Ïó¶øÑÔ£¬傳µÄÊÇÒýÓ㬶øÒýÓÃÖ¸ÏòµÄÊÇͬһ個對Ïó
*
* 輸³öjavac,javac
*/
StringBuffer bb = new StringBuffer("java");
stringBufferUpd(bb);
System.out.println(bb);

}
}