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String s1 = "Testing String";
String s2 = "Concatenation Performance";
String s3 = s1 + " " + s2;
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StringBuffer s = new StringBuffer();
s.append("Testing String");
s.append(" ");
s.append("Concatenation Performance");
String s3 = s.toString();
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public StringBuffer() { this(16); }
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public synchronized StringBuffer append(String str) {
if (str == null) {
str = String.valueOf(str);
}
int len = str.length();
int newcount = count + len;
if (newcount > value.length) expandCapacity(newcount);
str.getChars(0, len, value, count);
count = newcount; return this;
}
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* @author ÏļҼª<jijin0223@126.com>
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*/
public class SystemMenuTreeModel {
public SystemMenuTreeModel(){
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