public class StringExample{
    
    public static void main(String[] agrs){
        String s1 = new String("you are a student"),
                s2 = new String("how are you");
        if(s1.equals(s2)){
            System.out.println("s1与s2相同");
        }else{
            System.out.println("s1与s2不同");
        }
        String s3=new String("22030219851022024");
        if(s3.substring(0,6).equals("220302")){
            System.out.println("吉林身份证");
        }
        String s4 = new String("你"),
                s5 = new String("我");
        if(s4.compareTo(s5)==0){
            System.out.println("按字典序s4大于s5");
        }else{
            System.out.println("按字典序s4小于s5");
        }
//int position = path.indexOf(path.split("\\\\")[path.split("\\\\").length-1]);
        int position=0;
        String path="d:\\text\\java\\b.java";
        position=path.lastIndexOf("\\");
        System.out.println("d:\\text\\java\\b.java最后出现\\的位置是"+position);
        String fileName=path.substring(position+1);
/*        
        String tempp=path.substring(0,position);
        int pos=tempp.lastIndexOf("\\");
        tempp=tempp.substring(pos+1,position);
        System.out.println(tempp);
*/        
        System.out.println("d:\\text\\java\\b.java 中的文件名是"+fileName);
        
        String s6 = new String("100"),
                s7 = new String("123.678");
        int n1=Integer.valueOf(s6);
        double n2=Double.valueOf(s7);
        double m=n1+n2;
        System.out.println(m);
        
        String s8=String.valueOf(m);
        position = s8.indexOf(".");
        String temp = s8.substring(position+1);
        System.out.println("数字"+m+"有"+temp.length()+"位小数");
        String s9 = new String("AbCDEF");
        
        char a[] = s8.toCharArray();
        for (int i = a.length-1; i>=0; i--){
            System.out.print(" "+a[i]);
        }
//        System.out.println(s8);
    }
}