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1、例5-1classFather{privateintmoneyDollar=300;intmoneyHK=200;intadd(intx,inty){returnx+y;}}classSonextendsFather{intmoneyRMB=800;publicvoidchangMoneyHK(intx){moneyHK=x;}publicvoidchangMoneyRMB(intx){moneyRMB=x;}intsubs(intx,inty){returnx-y;}}classGrandSonextendsSon{intmulti(intx,inty){re
2、turnx*y;}}publicclassExample5_1{publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubinta=5,b=3;Sonson=newSon();GrandSonsunzi=newGrandSon();son.changMoneyHK(666);son.changMoneyRMB(5000);System.out.println("儿子的港币是继承的属性，当前的值是："+son.moneyHK);System.out.println("儿子的人民币是新增的属性，
3、当前的值是："+son.moneyRMB);System.out.printf("减法是儿子新增的功能,%d-%d等于%d",a,b,son.subs(a,b));System.out.printf("加法是儿子继承的功能,%d+%d等于%d",a,b,son.subs(a,b));System.out.println("孙子的港币和人民币都是继承的属性，当前的值是：");System.out.println("港币"+sunzi.moneyHK+"人民币："+sunzi.moneyRMB);System.out.printf("乘法是孙子新增的功能，%
4、d*%d等于%d",a,b,sunzi.multi(a,b));System.out.printf("加法是孙子继承的功能，%d+%d等于%d",a,b,sunzi.add(a,b));System.out.printf("减法是孙子继承的功能，%d-%d等于%d",a,b,sunzi.subs(a,b));}}例5-2classA{privateintx=10;protectedinty=20;voidf(){y=y+x;System.out.printf("x=%d,y=%d",x,y);}}classBextendsA{voidg(){y=
5、y+1;System.out.printf("y=%d",y);}}publicclassExample5_2{publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubBb=newB();b.g();b.f();b.g();}}例5-3classA{publicdoubley=11.456789;publicvoidf(){y=y+1;System.out.printf("y是double型的变量名，y=%f",y);}}classBextendsA{inty=0;publicvo
6、idg(){y=y+100;System.out.printf("y是int型的变量名，y=%d",y);}}publicclassExample5_3{publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubBb=newB();b.y=200;b.g();b.f();}}例5-4classA{protecteddoublex=8.0,y=0.888888;publicvoidspeak(){System.out.println("我喜欢NBA");}publicvoidcry(){y
7、=x+y;System.out.printf("y=%f",y);}}classBextendsA{inty=100,z;publicvoidspeak(){z=2*y;System.out.println("IloveThisGame");System.out.printf("y=%d,z=%d",y,z);}}publicclassExample5_4{publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubBb=newB();b.cry();b.speak();}}例5-5cla
8、ssA{publicin
