字符串的应用

public class sjx04 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String str1="Java技术学习班 20070326";
String str2="Java技术学习班 20070326 MLDN 老师";
String str3="330521199601221711";
System.out.println(str1.substring(10,17));
System.out.println(str1.charAt(7));
System.out.println(str1.replaceAll("0", ""));
System.out.println(str2.replaceAll(" ", ""));
System.out.println(str3.substring(6,14));
String str="MLDN JAVA";
String newStr=str.replaceAll("JAVA", "J2EE");
System.out.println("替换之后的结果："+newStr);
}
}