class JavaTest4_String {
public static void main(String[] args) {
String str1 = "IOS,ANDROID,BB,PALNM,WP,SYBIAN";
String str2 = new String("Str2");
char[] arr = {'S','t','r','2'};
String str3 = new String(arr);
String str4 = " Jue ";
//长度
System.out.println("长度");
System.out.println(str1+"\t的长度为:"+str1.length());
System.out.println(str2+"\t的长度为:"+str2.length());
System.out.println(str3+"\t的长度为:"+str3.length());
System.out.printl......
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