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Integer ​

java
public final class Integer extends Number implements Comparable<Integer>

compare ​

java
Integer.compare(10, 20); // -1
Integer.compare(20, 10); // 1
Integer.compare(10, 10); // 0

equals ​

java
Integer a = 100;
Integer b = 100;

a.equals(b); // true
java
Integer.toBinaryString(10);  // "1010"
Integer.toHexString(10);     // "a"
Integer.toOctalString(10);   // "12"

parseInt ​

字符串转为int

java
int a = Integer.parseInt("123");

valueOf ​

字符串转Integer

java
Integer b = Integer.valueOf("123");