数字文字中的下划线

int x1 = 2_969;            // Underscore in deciaml format 

int x2 = 1__929;           // Multiple consecutive underscores 
/**
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int x3 = 03_661;           // Underscore in octal literal 

int x4 = 0b0111_1011_0001; // Underscore in binary literal 

int x5 = 0x7_B_1;          // Underscores in hexadecimal literal 

byte b1 = 2_2_7;           // Underscores in decimal format 

double d1  = 1_969.09_19;  // Underscores in double literal