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public static void main(String[] args) {
char c = 57;
String str1 = c + "";
String str2 = String.valueOf(c);
StringBuilder sb = new StringBuilder();
String str3 = sb.append(c).toString();
StringBuffer stringBuffer = new StringBuffer();
String str4 = stringBuffer.append(c).toString();
String str5 = new Character(c).toString();
System.out.println("str1:" + str1);
System.out.println("str2:" + str2);
System.out.println("str3:" + str3);
System.out.println("str4:" + str4);
System.out.println("str5:" + str5);
}