Code Practice--java-4-String __ajax

Welcome to visit the blog Create string Create string Object-1

public class Test {public
    static void Main (string[] args) {
        string s = new string ();//create String
        System.out.print ln (s);
    }
}

Create a String Object-2

public class Test {public
    static void Main (string[] args) {
        char a[] = {' G ', ' o ', ' o ', ' d '};
        string s = new String (a); Create string
        System.out.println (a);
    }
}

Create a String Object-3

public class Test {public
    static void Main (string[] args) {
        char[] a = {' s ', ' t ', ' u ', ' d ', ' e ', ' n ', ' t '};
        string s = new String (A, 2, 4);
        System.out.println (s);
    }

string ManipulationString manipulation-stitching (+)

public class Test {public
    static void Main (string[] args) {
        string S1 = new String ("Hello");
        String s2 = new String ("World");
        String s = S1 + "" + S2;
        System.out.println (s);
    }

String manipulation-stitching (+)

public class Test {public
    static void Main (string[] args) {
        int booktime = 4;
        float practice = 2.5f;
        System.out.println ("I spend every day" + Booktime + "hour reading;" + Practice + "hours on the Machine");
    }

String manipulation-Get string length

public class Test {public
    static void Main (string[] args) {
        String s = "We are students";
        System.out.println ("Length of string is:" + s.length ());
    }

String manipulation-Gets the index position of the specified character

public class Test {public
    static void Main (string[] args) {
        String s = "We are students";
        The position of the System.out.println ("character S" in the string S is: "+ s.indexof (" s "));
        The position of the System.out.println ("character St" in the string S is: "+ s.indexof (" St "));
    }

public class Test {public
    static void Main (string[] args) {
        String s = "We are students";
        System.out.print (the last position of the character s in the string S is: ");
        System.out.println (S.lastindexof ("s"));
    }

String operation-Gets the character at the specified index position

public class Test {public
    static void Main (string[] args) {
        String s = ' Hello World ';
        Char mychar2 = S.charat (6);
        System.out.println (character bit with index position 6 in string s: + mychar2);
    }

String manipulation-remove leading and trailing spaces

public class Test {public
    static void Main (string[] args) {
        String S1 = "   Java class    ";
        String s2 = S1.trim ();
        System.out.println ("The original length of the string:" + s1.length ());
        System.out.println ("Remove space after the length:" + s2.length ());
        System.out.println ("The string to remove whitespace is:" + s2);
    }

String manipulation-Removes all spaces in a string

Import Java.util.StringTokenizer;
public class Test {public
    static void Main (string[] args) {
        String text = "  We are student  ";
        System.out.println ("Original string is:");
        System.out.println (text);
        StringTokenizer st = new StringTokenizer (text, "");
        StringBuffer sb = new StringBuffer ();
        int i = 1;
        while (St.hasmoreelements ()) {
            i++;
            Sb.append (St.nexttoken ());
        }
        System.out.println ("The string that removes all spaces in the string is:");
        System.out.println (Sb.tostring ());

    }

public class Test {public
    static void Main (string[] args) {
        String s = "J a V" a programming word  code  ;
        s = S.replaceall ("", "");
        System.out.println ("The string after removing the space is:" + s);
    }

String manipulation-string substitution

public class Test {public
    static void Main (string[] args) {
        String s = ' bad Bad study ';
        String news = S.replace ("Bad", "good");

        System.out.println ("The replaced string is:" + news);
    }
}

public class Test {public
    static void Main (string[] args) {
        String s = ' bad Bad study ';
        s = S.replacefirst ("Bad", "good");

        System.out.println ("The replaced string is:" + s);
    }

String operations-determining whether strings are equal

public class Test {public
    static void Main (string[] args) {
        string S1 = new String ("I am a Student");
        String s2 = new String ("I am a Student");
        String s3 = new String ("I AM A STUDENT");
        String s4 = S1;

        Boolean B1 = (S1 = = s2);
        Boolean B2 = (S1 = = S4);
        Boolean b3 = s1.equals (s2);
        Boolean b4 = s1.equals (S3);
        Boolean b5 = s1.equalsignorecase (s2);
        Boolean b6 = S1.equalsignorecase (S3);

        System.out.println ("S1 = = S2:" + B1);
        System.out.println ("S1 = = S4:" + B2);
        System.out.println ("S1 equals s2:" + B3);
        System.out.println ("S1 equals S3:" + B4);
        System.out.println ("S1 equalsignorecase S2:" + B5);
        System.out.println ("S1 equalsignorecase S3:" + B6);
    }

String manipulation-determines the beginning and end of a string

public class Test {public
    static void Main (string[] args) {
        String num1 = "22045612";
        String num2 = "21304578";

        Boolean B1 = Num1.startswith ("a");
        Boolean b2 = Num1.endswith ("the");
        Boolean b3 = Num2.startswith ("a");
        Boolean b4 = Num2.endswith ("the");

        System.out.println ("String Num1" starts with ' 22 '). "+ B1);
        System.out.println ("String Num1" ends with ' 78 '). "+ b2);
        System.out.println ("String num2" starts with ' 22 '). "+ B3);
        System.out.println ("String num2" ends with ' 78 '). "+ b4);
    }
}

String manipulation-Letter capitalization conversion

public class Test {public
    static void Main (string[] args) {
        string s = new String ("ABC DEF");
        String news1 = S.tolowercase ();
        String news2 = S.touppercase ();

        System.out.println ("Original string:" + s);
        System.out.println ("All converted to lowercase character string: + news1);
        " System.out.println ("Convert all to uppercase string: + News2);
    }"

String manipulation-string segmentation

public class Test {public
    static void Main (string[] args) {
        string s = new String ("Abc,def,ghi,gkl");
        string[] News = S.split (",");

        System.out.println ("Original string:" + s);
        System.out.println ("The string divided by split character is:");
        for (int i=0; i<news.length; i++) {
            System.out.println (news[i]);}}}

public class Test {public
    static void Main (string[] args) {
        string s = new String ("Abc,def,ghi,gkl");
        string[] News2 = S.split (",", 2);

        for (int j=0; j<news2.length; J + +) {
            System.out.println ("String divided once by split character is:");
            System.out.println (News2[j]);}}

Instance-strings are split according to the specified delimiter

public class Test {public
    static void Main (string[] args) {
        String s = "No words alone on the West floor, the month as hook, lonely indus deep courtyard lock Kiyoaki." "+ 
                    " cut constantly, the reason is still disorderly, is the sadness, not the general taste in the heart. ";
        System.out.println ("source string:" + s);
        System.out.println ("The length of the source string is:" + s.length ());
        string[] News = S.split (", |. ");
        for (int i=0; i<news.length; i++) {
            System.out.println (news[i]);
        System.out.println ("The length of the string array after the branch is:" + news.length);
    }

Instance-Determines whether a string is a number format

public class Test {public
    static void Main (string[] args) {
        String s = ' 12312312 ';
        if (Isnumber (s)) {
            System.out.println (s + "is number format");
        } else {
            System.out.println (s + "not number format");
        }
    Public

    Static Boolean isnumber (String str) {
        char[] c = Str.tochararray ();
        for (int i=0; i<c.length; i++) {
            if (Character.isdigit (c[i)))
                ;
            else return
                false;
        return true;
    }

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