Big example to demonstrate string class methods
package stringclass;
public class StringClassMethods {
public static void main(String[] args) {
String s1= new String (" String 1");
String s2 = " String 2" , s3 = " String 2";
// length method returns the length of string
System.out.println("s2.length() =" + s2.length());
//Returns the character at the specified index
System.out.println("s2.CharAt(1) =" + s2.charAt(4));
//getChars(int srcBegin,int srcEnd,char[] dst,int dstBegin)
char c[] = new char[s1.length()];
s1.getChars(0,s1.length(),c,0);
int i;
//printout the chars that are copied
for(i=0;i <c.length;i++)
System.out.print(c[i]);
System.out.println();
//public byte[] getBytes()
byte b[] = s1.getBytes();
for(i=0;i <b.length;i++)
System.out.print(b[i]+" ");
System.out.println();
//boolean equals(Object anObject)
Object o = new Object();
System.out.println("o.toString() =" + o + " s1.toString() ="+s1.toString());
System.out.println("s1.equals(o) =" + s1.equals(o));
//boolean equalsIgnoreCase(String anotherString)
System.out.println("s1.equalsIgnoreCase = "+ s1.equalsIgnoreCase(" sTRing 1"));
//int compareTo(String anotherString)
System.out.println("zz compared to a = "+ "zz".compareTo("a"));
//public boolean regionMatches(int toffset,String other,int ooffset,int len)
System.out.println("regionMatches "+ "abcabcabc".regionMatches(0,"abc",0,3));
//regionMatches(boolean ignoreCase,..) can be used to match regions by ignoring case
//startsWith(String prefix,int toffset)
System.out.println("startsWith "+ "abcabcabc".startsWith("abc",0));
//hashCode()
System.out.println("abc.hashCode() "+ "abc".hashCode());
//int indexOf(int ch)
System.out.println("abc.indexOf('c') "+ "abc".indexOf('c'));
//int lastIndexOf(int ch,int fromIndex)
System.out.println("abccccc.lastIndexOf('c',4) "+ "abccccc".lastIndexOf('c',4));
//int indexOf(String str)
System.out.println("abcabc.indexOf bc "+ "abcabc".indexOf("bc"));
//String substring(int beginIndex,int endIndex)
String sub = "iNetSolv".substring(2,7);
System.out.println("sub = "+ sub);
//trim
System.out.println(" string1 after trimming = " + s1.trim());
//concat
System.out.println(" after contating s1 with s2 " + s1.concat(s2));
//static String valueOf(char[] data)
System.out.println(" String constructed using valueof method" + String.valueOf(c));
System.out.println(" String constructed using valueof(float)" + String.valueOf(100.00F));
// public String intern() , very intresting method
//All literal strings and string-valued constant expressions are interned.
String si = s1.intern();
System.out.println(" si == s1 " + (si==s1));
String s10 = "literal";
String s11 = s10.intern();
System.out.println(" s10 == s11 " + (s10==s11));
String a = new String(s1);
System.out.println(" a == s1 " + (a==s1));
}
}
output:
s2.length() =9
s2.CharAt(1) =i
String 1
32 83 116 114 105 110 103 32 49
o.toString() =java.lang.Object@3e25a5 s1.toString() = String 1
s1.equals(o) =false
s1.equalsIgnoreCase = true
zz compared to a = 25
regionMatches true
startsWith true
abc.hashCode() 96354
abc.indexOf('c') 2
abccccc.lastIndexOf('c',4) 4
abcabc.indexOf bc 1
sub = etSol
string1 after trimming = String 1
after contating s1 with s2 String 1 String 2
String constructed using valueof method String 1
String constructed using valueof(float)100.0
si == s1 false
s10 == s11 true
a == s1 false
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