strmethod.java

来自「非常好的JAVA学习资料」· Java 代码 · 共 12 行

public class StrMethod {
   public static void main(String args[]){
      String str="Hello World!";
      System.out.println("charAt(6)="+str.charAt(6));
      System.out.println("length="+str.length());
      System.out.println("sub string="+str.substring(6)); 
      System.out.println("start with \"He\"="+str.startsWith("He"));
      System.out.println("upper case="+str.toUpperCase());
      System.out.println("\"World\" appares at " + str.indexOf("World", 0)+ " in \"" + str + "\"");
   }
}