本课内容Object类(1)Object类(2)clone()Object类:equals()Object类:equals()Object类:equals()classMyNewDateextendsMyDate{publicMyNewDate(inti,intj,intk){super(i,j,k);}//重写equals()方法publicbooleanequals(Objectobj){if(objinstanceofMyNewDate){MyNewDatem=(MyNewDate)obj;if(m.day==day&&m.month==month&&m.year==year){returntrue;}elsereturnfalse;}elsereturnfalse;}}publicclassTestDate{publicstaticvoidmain(Stringargs[]){MyDatem1=newMyDate(24,3,2006);MyDatem2=newMyDate(24,3,2006);System.out.println(m1.equals(m2));//?m1=newMyNewDate(24,3,2006);m2=newMyNewDate(24,3,2006);System.out.println(m1.equals(m2));//?}}hashcode（）Object类:toString()Object类:getClass()Comparable接口Comparable接口Comparable接口WrapperclassesMathclassSystem类StringclassStringclassStringclassStringclassStringclassStringBufferStringBufferStringvsStringBufferStringvsStringBufferStringTokenizerclassStringTokenizerclassString类split()作业