import java.io.*;
import java.util.*;
 
class Test{
    public static void main(String args[]){
        // equalsメソッドと==演算子の違い
        // ==演算子はインスタンスが同じものかどうかを調べ、その内容を調べない。
        // equalsメソッドは、インスタンスが違っても、内容が同じであればtrueを返す。
        String str1 = new String("矢口真理");
        String str2 = new String("矢口真理");
 
        System.out.print( "str1 == str2 : "  );
        System.out.println( str1 == str2 );
        System.out.print( "str1.equals(str2) : " );
        System.out.println( str1.equals(str2) );
        System.out.println();
 
        // replaceの例(C言語などと違い、２バイト文字もJavaでは１文字である)
        System.out.println( str1.replace('理', '里') );
        System.out.println();
 
        // concatメソッドと+演算子
        str2 = "abcde";
        System.out.println("\"123\" + str2 : " + "123" + str2 );
        System.out.println("\"123\".concat(str2) : " + "123".concat(str2) );
        System.out.println();
 
        // パス名からファイル名などを取り出す例
        String  strFileName;
        String  strPath;
        String  strAttribute;
        str1 = "C:\\Documents and Settings\\administrator\\デスクトップ\\新しいフォルダ\\test.java";
 
        // 拡張子
        try{
            strAttribute = str1.substring( str1.lastIndexOf('.'), str1.length() );
        }catch(IndexOutOfBoundsException e){
            strAttribute = "";
        }
 
        // パス名
        try{
            strPath = str1.substring( 0, str1.lastIndexOf('\\') );
        }catch(IndexOutOfBoundsException e){
            strPath = "";
        }
        // ファイル名
        try{
            strFileName = str1.substring( str1.lastIndexOf('\\')+1, str1.length() );
        }catch(IndexOutOfBoundsException e){
            strFileName = "";
        }
 
        System.out.println("拡張子：" + strAttribute);
        System.out.println("パス名：" + strPath);
        System.out.println("ファイル名：" + strFileName);
    }
}
 
 

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