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int fromIndex = 0;
int index = -1;
String str = "ABACA";
String s = "A";
System.out.print(s + "出现的位置是:");
while((index=str.indexOf(s, fromIndex)) != -1) {
fromIndex = index + s.length();
System.out.print(index + " ");
}
System.out.println();
String s="ABACA";
int index=x.indexOf('A');
while(index>=0){
System.out.println(index);
if(index+1<x.length()){
index=x.indexOf('A',index+1);
}else{
break;
}
}
String s="ABACA";
int index=x.indexOf('A');
while(index>=0){
System.out.println(index);
index=x.indexOf('A',index+1);
}