Java:
import java.util.Calendar;
public class main {
public static void main(String[] args) {
testStringBuilder();
}
public static void testStringBuilder() {
StringBuilder sBuilder = new StringBuilder();
System.out.println("1. string of new StringBuilder()");
if(sBuilder == null){
System.out.println("string:[is null]");
}else{
System.out.println("result:string:[" + sBuilder + "],length:[" + sBuilder.length() + "]");
}
StringBuilder sBuilder2 = new StringBuilder("");
System.out.println("2. string of new StringBuilder(\"\")");
if(sBuilder2 == null){
System.out.println("string:[is null]");
}else{
System.out.println("result:string:[" + sBuilder2 + "],length:[" + sBuilder2.length() + "]");
}
StringBuilder sBuilder3 = new StringBuilder();
String nullString = null;
sBuilder3.append(nullString);
System.out.println("3. string of new StringBuilder() append null");
if(sBuilder3 == null){
System.out.println("string:[is null]");
}else{
System.out.println("result:string:[" + sBuilder3 + "],length:[" + sBuilder3.length() + "]");
}
StringBuilder sBuilder4 = new StringBuilder("");
sBuilder4.append(nullString);
System.out.println("4. string of new StringBuilder(\"\") append null");
if(sBuilder4 == null){
System.out.println("string:[is null]");
}else{
System.out.println("result:string:[" + sBuilder4 + "],length:[" + sBuilder4.length() + "]");
}
}
