执行下列程序，输出结果为（）。publicclassB{publicstaticvoidmai(Strig[]args){itdoubley=10.5f;floatz=(float)(x*y);System.out.pritl(z);}}

执行下列程序，输出结果为（）。publicclassB{publicstaticvoidmain(String[]args){intx=5;doubley=10.5f;floatz=(float)(x*y);System.out.println(z);}}

publicclassA1{publicA1(){System.out.println(hello);}}publicclassA2extendsA1{publicA2(){System.out.println(world);}}publicclassA3extendsA2{publicA3(){System.out.println(china);}}publicclassB{publicstaticvoidmain(String[]args){A1௅୔ৠቹቹ뗐敔敔ৠቹ�敘ৠቹﲘǛ瘓鞸ி

publicclassA{publicdoublefunc1(inti,intj){returni+j;}publicdoublefunc1(doublei,doublej){returni+j+10;}publicdoublefunc1(floati,floatj){returni+j+20;}publicdoublefunc1(longi,longj){returni+j+30;}}publicclassB௅୔ৠቹቹ뗐敔敔ৠቹ�敘ৠቹﲘǛ瘓轸ி㰰ǚ㰰ǚብ盂ீЀ￾￿￾￿痰௅ብ盂
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