先贴代码:
StringBuilder dada = null;
for(int i=; i<; i++){
dada = new StringBuilder();
for(int j=; j<; j++){
dada.append("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF");
} }
System.out.println("释放前");
StringBuilder dada1 = new StringBuilder() ;
dada1.append("");
dada = dada1;
System.out.println("释放后");
放在内层,可见每次使用内存是74,000K多的内存,而,如果放到循环的外面,
StringBuilder dada = dada = new StringBuilder();;
for(int i=; i<; i++){
for(int j=; j<; j++){
dada.append("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF");
} }
就只会将数据一致累加的去处理,这样数据就大量的堆积起来了,
查看内存可看出是下面一种写法的内存是220,000K多的内存.