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int f() {
    f1();
    f2():
    f3();
}//Èç¹ûÔÚÿ¸öº¯Êýºó¶¼Ôö¼Ó³ö´íµÄÅжÏ(Èç¹ûÊÇÕý³£Âß¼­¿ÉÒÔ×ß²»Í¬µÄ·ÖÖ§)²¢ÊÍ·Å×ÊÔ´£¬ÄÇÕâ¸öº¯ÊýÄÚ»áÓÐÌ«¶àÓëÖ÷¸ÉÎÞ¹ØÓ°ÏìÇåÎúÔĶÁµÄ´úÂë´æÔÚ£¬¶øÇÒ¹ý¶àreturnÓÐʱ»áʹµÃ×ÊÔ´µÄÍü¼ÇÊÍ·Å£¬
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int f() {
    if (f1() < 0 ) goto end;
    f2():
    f3();
end:
    ...
}µ«Èç¹ûº¯Êýf1ºÍf2£¬f3ÐèÒª²»Í¬µÄ´íÎó´¦Àí£¬ÄÇ¿ÖÅÂÒªÔö¼Ó¶à¸ö±êÇ©£¬»òÕßÔÚifºó±ßÔö¼Ó±äÁ¿²¢ÔÚendºóͨ¹ý±äÁ¿À´Åжϣ¬²»¹ýÓÐif´æÔÚÕâÑù»¹ÊÇÓ°ÏìÇåÎú
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int f() {
    if_false_return (f1() , -1);//°ü¹üºê£¬Ö´Ðгö´í·µ»Ø¸ø¶¨Öµ£¬²»¹ýÔÚCÓïÑÔÄÚÕâËÆºõÊÇÒ»¸ö±È½ÏÀíÏëµÄ×ö·¨
    if_null_break(f2()):
    f3();//°ü¹üº¯Êý£¬²»¹ýÖ»ÄÜÌṩÍ˳ö³ÌÐòµÄ²Ù×÷£¬ºÜ¶àʱºòÎÒÃÇÐèÒªµÄÊÇreturn²Ù×÷
end:
    ...
}//ËÆºõÔĶÁÆðÀ´Ò²²¢²»Êæ·þ£¬
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try {
    //Ö÷¸ÉÂß¼­
}
catch() {
    //´íÎó´¦Àí
}//»¹ÓÐûÓÐÒ»ÖÖ¸üÀíÏëµÄ·½Ê½£¬Á¬try¶¼²»ÓÃ(Õâ¸ötry{}¿´ÆðÀ´Óеã¹Ö)£¬Æ©È纯Êýʽ²»»á³ö´íÄÇÑù£¬¿ÉÆ©Èç´ò¿ªÎļþ×ÜÊÇ»á³ö´íµÄ¡£
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f() {
    f1();
    f2();
    ...;
}
f_e() {
    ...£»//ÍêÈ«ÔÚÁíÒ»¸öº¯ÊýÄÚ½øÐÐÒì³£µÄ²¶×½ÄØ
}
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f() {
    f1();
    f2();
    ...;
catch:
    switch class_e {
    case e1:
        ...
    }
}//RUBYÖÐÊÇÈçºÎʵÏÖµÄÄØ£¬LUAÖÐÄØ£¿
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f() {
    if (open_file1_error)
}


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public class Father{
public void speak(){
System.out.println("Father");
}
}
public class Son extends Father{
public void speak(){
System.out.println("son");
}
}
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