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string類的使用方法詳解

更新時間：2006年12月27日 00:00:00 作者：

String：字符串類型

１、構(gòu)造函數(shù)。

String()

String(byte[] bytes)

String(byte[] bytes, int offset, int length)

String(char[] value)

String(char[] value, int offset, int count)

String(String original)

String(StringBuffer buffer)

	byte[] b = {'a','b','c','d','e','f','g','h','i','j'};
	char[] c = {'0','1','2','3','4','5','6','7','8','9'};

	String sb = new String(b);
	String sb_sub = new String(b,3,2);
	String sc = new String(c);
	String sc_sub = new String(c,3,2);
	String sb_copy = new String(sb);

	System.out.println("sb: " + sb );
	System.out.println("sb_sub: " + sb_sub );
	System.out.println("sc: " + sc );
	System.out.println("sc_sub: " + sc_sub );
	System.out.println("sb_copy: " + sb_copy );
結(jié)果為：
sb: abcdefghij
sb_sub: de
sc: 0123456789
sc_sub: 34
sb_copy: abcdefghij

２、方法。
說明：
1. 所有方法均為public；
2. 書寫格式：［修飾符］　<返回類型> <方法名（［參數(shù)列表］）>
如：
static int parseInt(String s) 表示：此方法（parseInt）為類方法（static），返回類型為（int），方法所需參數(shù)為String類型。

char charAt(int index)

	String s = new String("abcdefghijklmnopqrstuvwxyz");
	System.out.println("s.charAt(5): " + s.charAt(5) );
結(jié)果為：s.charAt(5): f

int compareTo(String anotherString)

int compareTo(Object o)

	String s1 = new String("abcdefghijklmn");
	String s2 = new String("abcdefghij");
	String s3 = new String("abcdefghijalmn");

	System.out.println("s1.compareTo(s2): " + s1.compareTo(s2) );//返回長度差
	System.out.println("s1.compareTo(s3): " + s1.compareTo(s3) );//返回'k'-'a'的差
結(jié)果為：
s1.compareTo(s2): 4
s1.compareTo(s3): 10

String concat(String str)

boolean contentEquals(StringBuffer sb)

static String copyValueOf(char[] data)

static String copyValueOf(char[] data, int offset, int count)

boolean endsWith(String suffix)

	String s1 = new String("abcdefghij");
	String s2 = new String("ghij");
	System.out.println("s1.endsWith(s2): " + s1.endsWith(s2) );
結(jié)果為：s1.endsWith(s2): true

boolean equals(Object anObject)

byte[] getBytes()

void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)

	char[] s1 = {'I',' ','l','o','v','e',' ','h','e','r','!'};//s1=I love her!
	String s2 = new String("you!");
	s2.getChars(0,3,s1,7);	//s1=I love you!
	System.out.println( s1 );
結(jié)果為：I love you!

int hashCode()

int indexOf(int ch)

int indexOf(int ch, int fromIndex)

int indexOf(String str)

int indexOf(String str, int fromIndex)

	String s = new String("write once, run anywhere!");
	String ss = new String("run");
	System.out.println("s.indexOf('r'): " + s.indexOf('r') );
	System.out.println("s.indexOf('r',2): " + s.indexOf('r',2) );
	System.out.println("s.indexOf(ss): " + s.indexOf(ss) );
結(jié)果為：
s.indexOf('r'): 1
s.indexOf('r',2): 12
s.indexOf(ss): 12

int lastIndexOf(int ch)

int lastIndexOf(int ch, int fromIndex)

int lastIndexOf(String str)

int lastIndexOf(String str, int fromIndex)

int length()

String replace(char oldChar, char newChar)

boolean startsWith(String prefix)

boolean startsWith(String prefix, int toffset)

	String s = new String("write once, run anywhere!");
	String ss = new String("write");
	String sss = new String("once");
	System.out.println("s.startsWith(ss): " + s.startsWith(ss) );
	System.out.println("s.startsWith(sss,6): " + s.startsWith(sss,6) );
結(jié)果為：
s.startsWith(ss): true
s.startsWith(sss,6): true

String substring(int beginIndex)

String substring(int beginIndex, int endIndex)

char[] toCharArray()

String toLowerCase()

String toUpperCase()

	String s = new String("java.lang.Class String");
	System.out.println("s.toUpperCase(): " + s.toUpperCase() );
	System.out.println("s.toLowerCase(): " + s.toLowerCase() );
結(jié)果為：
s.toUpperCase(): JAVA.LANG.CLASS STRING
s.toLowerCase(): java.lang.class string

static String valueOf(boolean b)

static String valueOf(char c)

static String valueOf(char[] data)

static String valueOf(char[] data, int offset, int count)

static String valueOf(double d)

static String valueOf(float f)

static String valueOf(int i)

static String valueOf(long l)

static String valueOf(Object obj)