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public static void main(String[] args) {
Integer x = 500;
long curMillis = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
String str = String.valueOf(x);
}
System.out.println("耗时:" + (System.currentTimeMillis() - curMillis));
curMillis = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
String str = "" + 500;
}
System.out.println("耗时:" + (System.currentTimeMillis() - curMillis));
curMillis = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
String str = "" + x;
}
System.out.println("耗时:" + (System.currentTimeMillis() - curMillis));
}