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3)replace() Ìæ»»
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String replace(char original,char replacement)
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String replace(CharSequence original,CharSequence replacement)
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5)valueOf() ת»»Îª×Ö·û´®
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8)length() È¡µÃ×Ö·û´®µÄ³¤¶È
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int len=s.length();
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      ch=”abc”.charAt(1);
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10)getChars() ½ØÈ¡¶à¸ö×Ö·û
void getChars(int sourceStart,int sourceEnd,char target[],int targetStart)
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target Ö¸¶¨½ÓÊÕ×Ö·ûµÄÊý×é
targetStart targetÖпªÊ¼¸´ÖÆ×Ó´®µÄϱêÖµ
Àý£ºString s=”this is a demo of the getChars method.”;
char buf[]=new char[20];
s.getChars(10,14,buf,0);
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String s = “Hello!ÄãºÃ£¡”;
byte[] bytes = s.getBytes();
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import java.io.File;
import java.io.IOException;
import java.util.Scanner;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JTextArea;
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